[seqfan] Re: SeqFan Digest, Vol 60, Issue 4

Brendan McKay Brendan.McKay at anu.edu.au
Mon Sep 16 14:06:48 CEST 2013


Ron's version might be correct, since the version in OEIS is certainly not correct.
If all row and column permutations are allowed, one gets A002865<http://oeis.org/A002865> for k=2,
A000512 for k=3, A000513<http://oeis.org/A000513> for k=4, A000516<http://oeis.org/A000516> for k=5, etc.

Brendan.
(I only get the daily digest so please cc me if you want a conversation.)

------------------

Message: 12
Date: Mon, 16 Sep 2013 04:15:03 -0700 (PDT)
From: Ron Hardin <rhhardin at att.net<mailto:rhhardin at att.net>>
To: Sequence Fanatics Discussion list <seqfan at list.seqfan.eu<mailto:seqfan at list.seqfan.eu>>
Subject: [seqfan] Re: Counting binary matrices - can these really be
new?
Message-ID:
<1379330103.84327.YahooMailNeo at web185001.mail.gq1.yahoo.com<mailto:1379330103.84327.YahooMailNeo at web185001.mail.gq1.yahoo.com>>
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I get 0 1 1 2 5 13 42 155 636 2889 14321 76834 for A229161 (offset 1)
matching its 1, 1, 2, 5, 13, 42, 155, 636, 2889, 14321 (offset 2)
using the definition two 1's in every row and column and
rows and columns in lexicographically nondecreasing order.

Maybe another term or so to come.


?
rhhardin at mindspring.com<mailto:rhhardin at mindspring.com>
rhhardin at att.net<mailto:rhhardin at att.net> (either)





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