First we lost Antti from seqfans, and now -- tragedy! -- we lose Richard Guy.<br>
<br>
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.<br>
<br>
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.<br>
<br>
Please, isn't there an urgent need to respond to what Antti and Richard
Guy have said, in hopes of luring them back? Please?<br>
<br>
-- prof. Jonathan Vos Post<br><br><div><span class="gmail_quote">On 1/11/07, <b class="gmail_sendername">Richard Guy</b> <<a href="mailto:rkg@cpsc.ucalgary.ca">rkg@cpsc.ucalgary.ca</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
I haven't received a copy of this, so perhaps<br>my request to be cut off was implemented even<br>before I made it! I send again, also using<br>the old (?) address. R.<br><br>---------- Forwarded message ----------
<br>Date: Wed, 10 Jan 2007 19:59:49 -0700 (MST)<br>From: Richard Guy <<a href="mailto:rkg@cpsc.ucalgary.ca">rkg@cpsc.ucalgary.ca</a>><br>To: <a href="mailto:seqfans@seqfan.net">seqfans@seqfan.net</a><br>Subject: Adieu
<br><br>Sequence fans,<br> Swan song.<br><br>1. Helena Verrill, in a talk at<br>New Orleans on Series for 1/pi<br>mentioned ``Almkvist - Zudilin<br>numbers''<br><br>1 -3 9 -3 -279 2997 -19431
<br><br>which I don't find in OEIS, but<br>then, as my Mother said, I'm not<br>a good looker.<br><br>2. In a paper written with Alex Fink & Mark Krusemeyer there<br>is the following table. These sequences have a good deal in
<br>common, but what is common is not always recorded at each<br>sequence. I will elaborate on this in a message to Neil's<br>Dream Team before much more water has flowed under the<br>bridge.<br><br>\begin{center}<br>
\begin{tabular}{cc|cc|cc|cc|cc}<br> $r$ & OEIS \# & $r$ & OEIS \# & $r$ & OEIS \# & $r$ & OEIS \# & $r$ & OEIS \#<br>\\<br>--14 & \ldots & --8 & A070998 & --2 & A001519 & 4 & A002878 & 10 & A057081 \\
<br>--13 & A001570 & --7 & A070997 & --1 & A000012 & 5 & A001834 & 11 & A054320 \\<br>--12
& A085260 & --6 & A049685
& 0 & A011655 & 6 & A030221 &
12 & A097783 \\<br>--11 & A077417 & --5 & A001653
& 1 & \ldots & 7 &
A002315 & 13 & A077416 \\<br>--10 & A078922 & --4 &
A004253 & 2 & A057079 & 8 &
A033890 & 14 & \ldots \\<br> --9 &
A072256 & --3 & A001835 & 3 &
A005408 & 9 & A057080 & 15 & A028230<br>\end{tabular}<br>\end{center}<br><br>3. Also arising from this paper is an iterative process,<br>which may be familiar to most seqfans, but which I don't<br>seem to be able to tie up with anything in OEIS. Here's
<br>a not very good example, because the degrees of the<br>polynomials go up too fast. Start with an array, say<br>the Omar Khayyam triangle<br><br> 1<br> 1
1<br> 1
2 1<br> 1
3 3 1<br> 1
4 6 4 1<br> 1
5 10 10 5 1<br> .........................<br><br>and then write the diagonals as polynomials, whose<br>coefficients, after normalization by (-1)^r * r!<br>form the array<br><br> 1
<br> 0
1<br> 0
1 1<br> 0
2 3 1<br> 0
6 11 6 1<br> 0 24 50 35 10
1<br> 0 120
274 225 85 15 1<br> .............................<br><br>which, in this case, I believe to be Stirling<br>numbers of the first kind. The diagonals are<br>A000012, A000217, A000914 (or A115057 -- is<br>this different?), A001303, ... . Repeat the
<br>process, yielding<br> 1<br> 0
1 1<br> 0 10 21 14
3<br> 0
1 11 47 97 96 36<br> ..............................<br><br>(are these in OEIS ? Schroeder numbers ???<br>this done by hand, and probably containing<br>errors) and repeat the process ad lib ...<br><br>The array formed by the sequences listed
<br>under 2. above form a similar, but in some<br>ways more interesting example, and presumably<br>many of the arrays in OEIS will also yield<br>sequences of arrays which will be of interest.<br><br>4. I reluctantly request that I be removed
<br>from the seqfan list since the messages have<br>reached a volume, and have often a content,<br>matched only by the spam that I receive. I<br>will send to Neil, or to his Dream Team, if<br>I have any serious comments or queries about
<br>OEIS, a beautiful project which I have seen<br>grow since I first met Neil over 40 years ago.<br><br>Best wishes to all serious contributors --<br>they know who they are. R.<br><br></blockquote></div><br>