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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
(list; graph; refs; listen; history; text; internal format)
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 September 28 14:04 EDT 2024. Contains 376297 sequences.
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