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%I #4 Oct 27 2013 18:02:04
%S 0,0,0,2,360,24050,974548,30543988,887242598,25527277010,725996132762,
%T 20534469030504,579032138128464,16301589383840348,458588230927764470,
%U 12895597377195089490,362551408586663834792,10191809036721993234348
%N Number of 4Xn 0..6 arrays x(i,j) with each element horizontally or antidiagonally next to at least one element with value (x(i,j)+1) mod 7, and upper left element zero
%C Row 4 of A230686
%H R. H. Hardin, <a href="/A230688/b230688.txt">Table of n, a(n) for n = 1..40</a>
%e All solutions for n=4
%e ..0..1..0..6....0..1..2..3
%e ..2..3..5..4....0..6..4..5
%e ..4..5..3..2....5..4..6..0
%e ..6..0..1..0....3..2..1..0
%K nonn
%O 1,4
%A _R. H. Hardin_, Oct 27 2013