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%I #4 Oct 31 2013 14:44:01
%S 0,186,3706,190364,8554562,400106488,18831479468,887265863604,
%T 41898727967522,1978685791204552,93492250825825256,
%U 4417805614428299566,208779099851162991776,9866957125308860636000,466327790501046362443268
%N Number of nX7 0..3 arrays x(i,j) with each element horizontally or vertically 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 A230899
%H R. H. Hardin, <a href="/A230898/b230898.txt">Table of n, a(n) for n = 1..22</a>
%e Some solutions for n=4
%e ..0..1..0..1..2..3..0....0..1..2..1..0..3..0....0..1..2..1..0..3..2
%e ..3..2..3..2..3..2..1....3..0..3..2..3..2..1....3..2..3..2..3..2..1
%e ..2..1..0..3..0..1..0....2..1..0..1..0..3..2....0..3..0..1..0..3..0
%e ..3..0..1..2..3..2..3....3..0..3..2..1..0..1....1..2..3..0..1..2..3
%K nonn
%O 1,2
%A _R. H. Hardin_, Oct 31 2013
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