A139014 Number of n X n symmetric binary matrices containing no more than four 1s in any 3 X 3 sub-block.

1, 2, 8, 32, 314, 5328, 141832, 6811777, 564010260, 79061881217, 19181583464422, 8010187646338006, 5733911909201520816, 7059956003044566892312

Offset

0,2

Links

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

Crossrefs

Sequence in context: A062797 A369645 A134751 * A063505 A085466 A084039

Adjacent sequences: A139011 A139012 A139013 * A139015 A139016 A139017

Keyword

nonn

Author

R. H. Hardin, May 31 2008

Status

approved