A139015 Number of n X n symmetric binary matrices containing no more than five 1s in any 3 X 3 sub-block.

1, 2, 8, 44, 530, 11951, 480173, 36013602, 4995124766, 1274350081146, 600639918104102, 522558166736741057, 838554327431003466468, 2483352676636753274201147

Offset

0,2

Links

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

Crossrefs

Sequence in context: A002500 A002833 A348107 * A197996 A258622 A290442

Adjacent sequences: A139012 A139013 A139014 * A139016 A139017 A139018

Keyword

nonn

Author

R. H. Hardin, May 31 2008

Status

approved