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.

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

Links

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

Crossrefs

Sequence in context: A147225 A147061 A147386 * A131414 A333448 A050308

Adjacent sequences: A145756 A145757 A145758 * A145760 A145761 A145762

Keyword

nonn

Author

R. H. Hardin, Oct 17 2008

Status

approved