%I
%S 8,160,8643,1396000,624608260,771907128421,2659360843218429,
%T 25614152794948938706
%N Half the number of (n+1)X(n+1) binary arrays with no 2X2 subblock sum differing from a horizontal or vertical neighbor subblock sum by more than one
%C Diagonal of A184614
%e Some solutions for 4X4
%e ..1..1..0..1....1..1..1..1....1..0..0..0....0..0..1..1....0..1..0..1
%e ..1..0..1..1....1..1..0..0....0..1..0..0....1..1..1..1....0..1..0..1
%e ..0..1..0..1....1..1..1..1....1..1..0..1....1..0..1..0....1..1..0..1
%e ..0..0..1..0....0..1..0..1....0..0..0..1....1..1..1..1....1..1..1..1
%e ...
%e ...3..2..3.......4..3..2.......2..1..0.......2..3..4.......2..2..2...
%e ...2..2..3.......4..3..2.......3..2..1.......3..3..3.......3..2..2...
%e ...1..2..2.......3..3..3.......2..1..2.......3..3..3.......4..3..3...
%K nonn
%O 1,1
%A _R. H. Hardin_ Jan 18 2011
