%I
%S 1,9,256,33057,16796160,34359738368
%N Half the number of n X n 0..2 arrays with no element equal to the sum mod 3 of its horizontal and vertical neighbors
%C Diagonal of A183501
%e Some solutions for 3X3
%e ..0..2..0....0..0..1....0..1..2....0..1..1....0..2..1....1..1..0....1..1..1
%e ..2..0..0....1..0..2....0..1..2....1..2..1....2..0..0....2..2..1....2..0..2
%e ..0..0..2....2..2..2....0..2..0....0..1..0....0..0..1....0..2..1....2..2..2
%K nonn
%O 1,2
%A _R. H. Hardin_ Jan 05 2011
