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A145757 Number of n X n binary arrays with all ones connected only either three adjacent vertically or three adjacent horizontally. 0
1, 1, 9, 45, 476, 6933, 199238, 8764691, 657200985, 80295518797, 16444907566268, 5549422397331424, 3112070848837147326 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..13.

CROSSREFS

Sequence in context: A001556 A230063 A009432 * A058824 A244302 A177742

Adjacent sequences:  A145754 A145755 A145756 * A145758 A145759 A145760

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 17 2008

STATUS

approved

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Last modified October 13 23:52 EDT 2019. Contains 327983 sequences. (Running on oeis4.)