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%I #8 Jan 27 2013 02:36:29
%S 512,19904,1537476,209888936,21242244160,3176962520030
%N Number of (n+2)X(n+2) binary arrays with 3X3 subblock sums nondecreasing rightwards and downwards.
%C Diagonal of A186840
%e Some solutions for 4X4
%e ..1..0..1..0....1..0..1..0....1..1..0..0....0..0..0..0....1..1..0..1
%e ..1..0..0..1....0..0..1..1....0..0..1..1....0..0..0..1....0..0..0..1
%e ..0..0..0..1....1..1..1..1....0..1..1..0....1..0..0..0....1..1..0..0
%e ..1..1..0..1....1..1..0..1....1..1..0..0....1..1..1..1....0..1..1..0
%K nonn
%O 1,1
%A _R. H. Hardin_, Feb 27 2011
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