cp's OEIS Frontend

A208097 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).

%I A208097 #12 May 07 2014 05:21:17
%S A208097 2,4,30,377,7239,193228,6752442,296290708,15835464207,1007305486325,
%T A208097 74890158775564,6413015600048526,624933541074620780,
%U A208097 68603269124243415049,8411144435499643711885,1143251056778815843116186
%N A208097 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 A208097 Row 2 of A208096.
%H A208097 R. H. Hardin, <a href="/A208097/b208097.txt">Table of n, a(n) for n = 1..19</a>
%e A208097 Some solutions for n=4:
%e A208097 ..0..1..2..1....0..1..0..1....0..1..2..0....0..1..2..0....0..1..2..0
%e A208097 ..3..1..4..5....0..1..0..2....0..1..3..1....0..1..2..0....3..1..2..4
%K A208097 nonn
%O A208097 1,1
%A A208097 _R. H. Hardin_, Feb 23 2012