Adieu (fwd)

[Jonathan Post]

First we lost Antti from seqfans, and now -- tragedy! -- we lose Richard
Guy.

I am one of the offenders.  I have submitted hundreds of sequences, none of
them officially "nice."  I have made apparently annoying emails to seqfans.
I have, since gentle hints were made, cut back drastically on both OEIS
submsissions and seqfans gmails.  I did so to improve the signal-to-noise
ratio.  I have only submit, in the past month or more, seqs from published
papers, and those pre-edited by Associate Editors of OEIS, as coauthored. I
would rather hear what Richard Guy has to say than say anything myself.

Can any other of "the usual suspects" voluntarily embargo their submissions
and emails, as I did, and with respect to Neil J. A. Sloane's "vacation"?
That vacation has not stopped some people.

Please, isn't there an urgent need to respond to what Antti and Richard Guy
have said, in hopes of luring them back?  Please?

-- prof. Jonathan Vos Post

On 1/11/07, Richard Guy <rkg at cpsc.ucalgary.ca> wrote:
>
> I haven't received a copy of this, so perhaps
> my request to be cut off was implemented even
> before I made it!  I send again, also using
> the old (?) address.       R.
>
> ---------- Forwarded message ----------
> Date: Wed, 10 Jan 2007 19:59:49 -0700 (MST)
> From: Richard Guy <rkg at cpsc.ucalgary.ca>
> To: seqfans at seqfan.net
> Subject: Adieu
>
> Sequence fans,
>                Swan song.
>
> 1.  Helena Verrill, in a talk at
> New Orleans on   Series for  1/pi
> mentioned  ``Almkvist - Zudilin
> numbers''
>
> 1  -3  9  -3  -279  2997  -19431
>
> which I don't find in OEIS, but
> then, as my Mother said, I'm not
> a good looker.
>
> 2.  In a paper written with Alex Fink & Mark Krusemeyer there
> is the following table.  These sequences have a good deal in
> common, but what is common is not always recorded at each
> sequence.  I will elaborate on this in a message to Neil's
> Dream Team before much more water has flowed under the
> bridge.
>
> \begin{center}
> \begin{tabular}{cc|cc|cc|cc|cc}
>   $r$ & OEIS \# & $r$ & OEIS \# & $r$ & OEIS \# & $r$ & OEIS \# & $r$ &
> OEIS \#
> \\
> --14 & \ldots  & --8 & A070998 & --2 & A001519 & 4 & A002878 & 10 &
> A057081 \\
> --13 & A001570 & --7 & A070997 & --1 & A000012 & 5 & A001834 & 11 &
> A054320 \\
> --12 & A085260 & --6 & A049685 &  0  & A011655 & 6 & A030221 & 12 &
> A097783 \\
> --11 & A077417 & --5 & A001653 &  1  & \ldots  & 7 & A002315 & 13 &
> A077416 \\
> --10 & A078922 & --4 & A004253 &  2  & A057079 & 8 & A033890 & 14 &
> \ldots  \\
>   --9 & A072256 & --3 & A001835 &  3  & A005408 & 9 & A057080 & 15 &
> A028230
> \end{tabular}
> \end{center}
>
> 3.  Also arising from this paper is an iterative process,
> which may be familiar to most seqfans, but which I don't
> seem to be able to tie up with anything in OEIS.  Here's
> a not very good example, because the degrees of the
> polynomials go up too fast.  Start with an array, say
> the Omar Khayyam triangle
>
>                           1
>                         1   1
>                       1   2   1
>                     1   3   3   1
>                   1   4   6   4   1
>                 1   5  10  10   5   1
>               .........................
>
> and then write the diagonals as polynomials, whose
> coefficients, after normalization by  (-1)^r * r!
> form the array
>
>                           1
>                         0   1
>                       0   1   1
>                     0   2   3   1
>                   0   6  11   6   1
>                 0  24  50  35  10   1
>               0  120 274 225 85  15   1
>             .............................
>
> which, in this case, I believe to be Stirling
> numbers of the first kind.  The diagonals are
> A000012, A000217, A000914 (or A115057 -- is
> this different?), A001303, ... .   Repeat the
> process, yielding
>                           1
>                       0   1   1
>                   0  10  21  14   3
>               0   1  11  47  97  96  36
>            ..............................
>
> (are these in OEIS ?  Schroeder numbers ???
> this done by hand, and probably containing
> errors)  and repeat the process ad lib ...
>
> The array formed by the sequences listed
> under 2. above form a similar, but in some
> ways more interesting example, and presumably
> many of the arrays in OEIS will also yield
> sequences of arrays which will be of interest.
>
> 4.  I reluctantly request that I be removed
> from the seqfan list since the messages have
> reached a volume, and have often a content,
> matched only by the spam that I receive.  I
> will send to Neil, or to his Dream Team, if
> I have any serious comments or queries about
> OEIS, a beautiful project which I have seen
> grow since I first met Neil over 40 years ago.
>
> Best wishes to all serious contributors --
> they know who they are.     R.
>
>
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