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%I #4 Oct 25 2013 13:06:23
%S 0,0,0,509978,128706852,35145166536,8937075346246,2294186499807542,
%T 587879941920096164,150672100573449544628,38618667880671318212660,
%U 9898104313860041433700268,2536935635060076589332989468
%N Number of 7Xn 0..2 arrays x(i,j) with each element horizontally or antidiagonally next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero
%C Row 7 of A230614
%H R. H. Hardin, <a href="/A230619/b230619.txt">Table of n, a(n) for n = 1..27</a>
%e Some solutions for n=4
%e ..0..1..0..0....0..1..0..2....0..1..0..1....0..1..0..2....0..1..0..0
%e ..2..0..1..0....2..0..1..0....2..0..2..1....2..0..1..0....2..0..1..2
%e ..1..2..2..0....1..2..2..0....1..2..0..1....1..2..2..1....2..1..0..1
%e ..0..1..1..0....0..1..1..2....1..1..2..1....0..1..0..2....0..2..2..0
%e ..1..2..2..1....2..0..0..2....2..0..1..2....1..2..2..1....1..2..1..0
%e ..0..1..0..0....2..1..0..2....2..1..0..2....1..0..2..2....0..1..2..1
%e ..1..2..1..0....0..2..1..0....0..0..1..0....2..1..0..2....1..2..0..2
%K nonn
%O 1,4
%A _R. H. Hardin_, Oct 25 2013
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