A139014 - OEIS

A139014

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

%I #4 Mar 31 2012 12:35:07

%S 1,2,8,32,314,5328,141832,6811777,564010260,79061881217,

%T 19181583464422,8010187646338006,5733911909201520816,

%U 7059956003044566892312

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

%K nonn

%O 0,2

%A _R. H. Hardin_, May 31 2008