A139010 - OEIS

A139010

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

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

%S 1,2,5,10,46,298,1984,21540,331078,6336017,173488605,6651795802,

%T 340061007958,23986915555236,2342976613039703,311875652121439248,

%U 56925380854171209808,14298682300093479646164,4921580523122987792169589

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

%K nonn

%O 0,2

%A _R. H. Hardin_, May 31 2008