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%I #5 Mar 31 2012 12:36:34
%S 658,50729,3603458,276030525,21989253467,1791994477631,
%T 148260119458624,12388301166414053,1042156486950351473,
%U 88068293220220746165,7464940011082766165729,634039417143962239696103
%N Number of 2nX6 0..3 arrays with values 0..3 introduced in row major order and each element unequal to exactly two horizontal and vertical neighbors
%C Column 3 of A198209
%H R. H. Hardin, <a href="/A198207/b198207.txt">Table of n, a(n) for n = 1..31</a>
%e Some solutions for n=4
%e ..0..1..0..1..0..2....0..1..0..1..0..2....0..1..0..1..0..2....0..1..0..1..0..1
%e ..1..1..0..1..0..0....1..1..0..1..0..0....1..1..0..1..0..0....1..1..0..1..0..0
%e ..0..0..0..1..1..1....0..0..0..1..1..1....0..0..0..1..1..1....0..0..0..1..1..1
%e ..1..2..2..2..2..3....1..2..2..0..0..2....1..2..2..0..0..2....1..2..2..2..2..2
%e ..1..2..1..1..2..3....1..2..2..0..0..2....1..2..2..0..0..2....1..2..3..3..3..3
%e ..0..2..1..1..2..2....2..0..0..3..3..1....3..3..3..3..3..3....2..2..3..1..1..2
%e ..0..2..2..2..3..3....2..0..0..3..3..1....2..2..2..2..2..2....1..1..3..1..1..2
%e ..1..0..0..2..3..2....0..3..3..2..2..3....1..0..0..1..1..0....0..1..3..2..2..0
%K nonn
%O 1,1
%A _R. H. Hardin_ Oct 22 2011
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