[seqfan] Re: Connected relations A287297 a dupe?

[Neil Sloane]

That's quite common.  We should keep both versions!

(When we are reading a symmetric square array by antidiagonals, it is
always hard to decide whether
to give the full antidiagonals or to stop half way
and call it a triangle. Having both
versions is the best solution)

Best regards
Neil

Neil J. A. Sloane, President, OEIS Foundation.
11 South Adelaide Avenue, Highland Park, NJ 08904, USA.
Also Visiting Scientist, Math. Dept., Rutgers University, Piscataway, NJ.
Phone: 732 828 6098; home page: http://NeilSloane.com
Email: njasloane at gmail.com


On Fri, May 26, 2017 at 2:08 PM, Frank Adams-Watters via SeqFan <
seqfan at list.seqfan.eu> wrote:

> Yes, they're the same. The only difference is that A287297 regards the
> data as an array by anti-diagonals, while A262307 regards it as a
> triangle. To me, regarding it as an array seems more natural.
>
> Whichever is kept should describe both ways of looking at it.
> Currently the description in A262307 is not really adequate.
>
> Franklin T. Adams-Watters
>
>
> -----Original Message-----
> From: Richard J. Mathar <mathar at mpia-hd.mpg.de>
> To: seqfan <seqfan at seqfan.eu>
> Sent: Fri, May 26, 2017 12:52 pm
> Subject: [seqfan] Connected relations A287297 a dupe?
>
> Are oeis.org/A287297 and oeis.org/A262307 the same sequence?
> These count binary matrices with no all-zero rows or columns.
> There seem to be two relevant works in the literature,mentioned in
> A262307 and in A227322. More or less equivalent
> ways of reading the array have been added in the Xrefs in A262307.
>
> Richard--Seqfan Mailing list - http://list.seqfan.eu/
>
> --
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