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A140306
Number of n X n binary matrices containing at most three 1's in any 3 X 3 sub-block.
0
1, 2, 15, 130, 4852, 456904, 73948482, 35616138799, 43142990277818, 115017363443317954, 771239506285440035857
OFFSET
0,2
CROSSREFS
Cf. A139810.
Sequence in context: A132182 A365151 A371585 * A374975 A143924 A217483
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 27 2008
STATUS
approved