%I
%S 15,1080,587208,953124784,3410310590912,22727131144960768,
%T 253335104721267417984
%N Number of nX4 nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any diagonal or antidiagonal neighbor (colorings ignoring permutations of colors)
%C Column 4 of A207981
%e Some solutions for n=4
%e ..0..0..0..0....0..1..0..0....0..0..0..0....0..0..1..0....0..0..0..0
%e ..1..1..2..1....2..1..2..1....1..1..2..1....1..2..1..0....1..1..1..1
%e ..0..3..0..0....0..0..0..0....2..0..0..0....0..0..1..0....2..0..0..0
%e ..4..1..1..1....1..1..1..1....1..1..1..2....2..2..1..0....1..1..1..1
%K nonn
%O 1,1
%A _R. H. Hardin_ Feb 22 2012
