%I
%S 2,16,283,11971,1330361,418147052,392636087774,1142471406383630
%N Number of n X n 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X(n+1) binary array having an odd sum, with rows and columns of the latter in lexicographically nondecreasing order
%C Diagonal of A227679
%e Some solutions for n=4
%e ..0..0..1..0....0..1..0..0....0..1..0..0....1..0..0..0....0..0..0..1
%e ..1..0..1..1....1..0..0..0....0..0..0..1....0..0..1..1....0..0..1..0
%e ..0..0..1..0....0..1..1..1....1..0..0..0....0..1..0..1....0..1..1..0
%e ..1..0..0..1....0..1..1..1....0..1..0..0....1..1..1..1....1..0..0..1
%K nonn
%O 1,1
%A _R. H. Hardin_ Jul 19 2013
