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A140179
Half the number of n X n symmetric binary matrices with adjacent rows differing in at most four positions.
0
1, 4, 32, 512, 14513, 603485, 29856303, 1487335683, 68719476736, 2898212537994
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..10.
CROSSREFS
Sequence in context:
A102557
A144935
A153511
*
A118990
A127945
A036442
Adjacent sequences:
A140176
A140177
A140178
*
A140180
A140181
A140182
KEYWORD
nonn
AUTHOR
R. H. Hardin
, Jun 15 2008
STATUS
approved
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Last modified March 28 11:59 EDT 2024. Contains 371254 sequences. (Running on oeis4.)