%I #12 May 07 2014 05:21:17
%S 2,4,30,377,7239,193228,6752442,296290708,15835464207,1007305486325,
%T 74890158775564,6413015600048526,624933541074620780,
%U 68603269124243415049,8411144435499643711885,1143251056778815843116186
%N Number of 2 X n nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any horizontal, diagonal or antidiagonal neighbor (colorings ignoring permutations of colors).
%C Row 2 of A208096.
%H R. H. Hardin, <a href="/A208097/b208097.txt">Table of n, a(n) for n = 1..19</a>
%e Some solutions for n=4:
%e ..0..1..2..1....0..1..0..1....0..1..2..0....0..1..2..0....0..1..2..0
%e ..3..1..4..5....0..1..0..2....0..1..3..1....0..1..2..0....3..1..2..4
%K nonn
%O 1,1
%A _R. H. Hardin_, Feb 23 2012