%I #6 Dec 18 2015 18:17:47
%S 1,6,40,594,27320,3707781,926499600,539621963877,739769209147928
%N Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 3,0,2,4,1 for x=0,1,2,3,4
%C Every 0 is next to 0 3's, every 1 is next to 1 0's, every 2 is next to 2 2's, every 3 is next to 3 4's, every 4 is next to 4 1's
%C Diagonal of A196456
%e Some solutions for n=4
%e ..1..0..0..1....1..0..0..0....1..0..0..1....1..0..0..1....1..0..0..1
%e ..1..2..2..2....1..2..2..0....2..2..0..1....1..2..2..1....1..2..2..2
%e ..0..2..0..2....0..2..2..0....2..2..0..1....0..2..2..0....0..2..0..2
%e ..1..2..2..2....0..1..1..0....0..0..0..1....0..0..1..1....0..2..2..2
%K nonn
%O 1,2
%A _R. H. Hardin_ Oct 02 2011