A140305 Number of n X n binary matrices containing no more than two 1s in any 3 X 3 sub-block.

1, 2, 11, 46, 824, 27178, 1020762, 102044420, 20297233254, 6218446852487, 3906297811846469, 4829512709969500388, 10588146860457194561192, 44163637535605999104548698

Offset

0,2

Links

Table of n, a(n) for n=0..13.

Crossrefs

Cf. A139810.

Sequence in context: A000176 A042927 A292533 * A229019 A376910 A142346

Adjacent sequences: A140302 A140303 A140304 * A140306 A140307 A140308

Keyword

nonn

Author

R. H. Hardin, May 27 2008

Status

approved