A140309 Number of n X n binary matrices containing no more than six 1s in any 3 X 3 sub-block.

1, 2, 16, 466, 51512, 21425198, 32840182186, 188637643581570, 4048457379398984078, 323937479341259299455434, 96758393657902322435446080112

Offset

0,2

Links

Table of n, a(n) for n=0..10.

Crossrefs

Cf. A139810.

Sequence in context: A012146 A113109 A223563 * A201383 A354279 A306816

Adjacent sequences: A140306 A140307 A140308 * A140310 A140311 A140312

Keyword

nonn

Author

R. H. Hardin, May 27 2008

Status

approved