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%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
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