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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, no adjacent elements equal, and upper left element zero
1

%I #4 Nov 06 2013 05:40:01

%S 0,2258,162766,15270416,1450042214,138246711032,13176773912306,

%T 1256579264497704,119835433235557440,11428554679771925538,

%U 1089931792916983396432,103946081601529344813032

%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, no adjacent elements equal, and upper left element zero

%C Column 7 of A231246

%H R. H. Hardin, <a href="/A231245/b231245.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=3

%e ..0..1..2..3..0..3..2....0..1..2..1..0..3..0....0..1..2..1..0..3..2

%e ..2..1..2..3..2..1..2....2..3..2..3..2..1..2....2..3..0..1..0..1..0

%e ..0..3..0..3..2..1..0....0..1..0..1..0..3..2....0..1..2..3..2..3..2

%K nonn

%O 1,2

%A _R. H. Hardin_, Nov 06 2013