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%I #4 Nov 03 2013 07:15:41
%S 0,1616,33696,4110640,274004640,22665736960,1729680196768,
%T 136193662172048,10596817937397952,828295717027921136,
%U 64630520730089632896,5046381265566772229552,393923451049853535867872
%N Number of nX7 0..3 arrays x(i,j) with each element horizontally, diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 4 and at least one element with value (x(i,j)-1) mod 4, no adjacent elements equal, and upper left element zero
%C Column 7 of A231049
%H R. H. Hardin, <a href="/A231048/b231048.txt">Table of n, a(n) for n = 1..210</a>
%e Some solutions for n=4
%e ..0..1..0..1..2..1..2....0..1..0..1..2..3..0....0..1..0..1..2..3..0
%e ..0..3..2..1..0..3..2....0..3..2..3..2..1..2....0..3..2..3..0..1..0
%e ..0..1..2..1..0..3..0....0..1..2..3..2..1..2....0..1..0..3..0..1..2
%e ..0..3..0..3..2..1..0....0..3..0..1..0..3..0....0..3..2..3..2..3..0
%K nonn
%O 1,2
%A _R. H. Hardin_, Nov 03 2013