A139017 - OEIS

A139017

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

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

%S 1,2,8,60,906,27189,1613401,189475577,44047431458,20270048678813,

%T 18464881592730174,33296006308979741676,118848050819226253876856,

%U 839743872159535017880129008,11745095000736439254980601740977,325177925025179018978272596740130128

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

%K nonn

%O 0,2

%A _R. H. Hardin_, May 31 2008