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A145759 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only either three adjacent vertically or three adjacent horizontally. 0
1, 1, 5, 1, 10, 1, 76, 9, 925, 45, 17770, 476, 511138, 6933, 26358558, 199238, 2219828172, 8764691, 309763488262, 657200985, 71319461606595, 80295518797, 27347236640456545, 16444907566268, 17338896606364957095, 5549422397331424 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..26.

CROSSREFS

Sequence in context: A147225 A147061 A147386 * A131414 A050308 A063475

Adjacent sequences:  A145756 A145757 A145758 * A145760 A145761 A145762

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 17 2008

STATUS

approved

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Last modified October 14 11:36 EDT 2019. Contains 327996 sequences. (Running on oeis4.)