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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
CROSSREFS
Sequence in context: A102557 A144935 A153511 * A118990 A127945 A036442
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.)