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%I #3 Oct 30 2013 17:08:25
%S 0,18,2114,108006,10872238,888633610,75341251814,6484756891722,
%T 546028214903014
%N Number of nX7 0..2 arrays x(i,j) with each element horizontally or vertically next to at least one element with value (x(i,j)+1) mod 3 and at least one element with value (x(i,j)-1) mod 3, and upper left element zero
%C Column 7 of A230819
%e Some solutions for n=4
%e ..0..2..1..0..1..0..2....0..2..1..0..2..0..1....0..2..1..0..0..2..1
%e ..1..1..0..2..2..0..1....1..2..0..1..1..0..2....1..0..2..2..1..2..0
%e ..2..0..1..1..2..0..1....2..0..1..2..0..0..1....2..2..1..0..2..1..1
%e ..0..1..2..0..1..0..2....1..0..2..0..1..2..0....0..1..2..0..1..0..2
%K nonn
%O 1,2
%A _R. H. Hardin_, Oct 30 2013