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%I #4 Mar 31 2012 12:35:07
%S 1,2,11,46,824,27178,1020762,102044420,20297233254,6218446852487,
%T 3906297811846469,4829512709969500388,10588146860457194561192,
%U 44163637535605999104548698
%N Number of n X n binary matrices containing no more than two 1s in any 3 X 3 sub-block.
%Y Cf. A139810.
%K nonn
%O 0,2
%A _R. H. Hardin_, May 27 2008