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

%S 1,2,15,130,4852,456904,73948482,35616138799,43142990277818,

%T 115017363443317954,771239506285440035857

%N Number of n X n binary matrices containing at most three 1's in any 3 X 3 sub-block.

%Y Cf. A139810.

%K nonn

%O 0,2

%A _R. H. Hardin_, May 27 2008