A140307 Number of n X n binary matrices containing at most four 1's in any 3 X 3 sub-block.

1, 2, 16, 256, 15982, 3082378, 1476568000, 2280441045555, 10599616558936358, 140380164790852384033

Offset

0,2

Links

Table of n, a(n) for n=0..9.

Crossrefs

Cf. A139810.

Sequence in context: A090727 A380018 A108242 * A114039 A090305 A358145

Adjacent sequences: A140304 A140305 A140306 * A140308 A140309 A140310

Keyword

nonn

Author

R. H. Hardin, May 27 2008

Status

approved