A140310 Number of n X n binary matrices containing no more than seven 1s in any 3 X 3 sub-block.

1, 2, 16, 502, 61788, 29829353, 56365481377, 417452923577327, 12115365147171963168, 1377708150938828616858899, 613888995116283293759860580312, 1071847970096627711898648239726154442

Offset

0,2

Links

Table of n, a(n) for n=0..11.

Crossrefs

Cf. A139810.

Sequence in context: A068472 A168402 A168406 * A168403 A140311 A366513

Adjacent sequences: A140307 A140308 A140309 * A140311 A140312 A140313

Keyword

nonn

Author

R. H. Hardin, May 27 2008

Status

approved