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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
OFFSET
1,3
CROSSREFS
Sequence in context: A147225 A147061 A147386 * A131414 A333448 A050308
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 17 2008
STATUS
approved