%I
%S 16,700,31718,1478756,70004726,3337609528,158791292898,7572454386112,
%T 361223237102398,17233549055351780,822235886561754748,
%U 39230600563964575264,1871782716035228820002,89307446755046275015160
%N Number of 2nX12 0..2 arrays with values 0..2 introduced in row major order and each element equal to exactly two horizontal and vertical neighbors
%C Column 6 of A198285
%H R. H. Hardin, <a href="/A198283/b198283.txt">Table of n, a(n) for n = 1..20</a>
%e Some solutions for n=3
%e ..0..0..0..0..0..0..1..1..1..1..1..1....0..0..1..1..1..1..1..1..1..1..0..0
%e ..0..1..1..1..1..0..1..0..0..2..2..1....0..0..1..2..2..0..0..2..2..1..0..0
%e ..0..1..2..2..1..0..1..0..0..2..2..1....2..2..1..2..2..0..0..2..2..1..2..2
%e ..0..1..2..2..1..0..1..2..2..1..1..1....2..2..1..1..1..2..2..1..1..1..2..2
%e ..0..1..1..1..1..0..1..2..2..1..0..0....1..1..2..2..1..2..2..1..2..2..1..1
%e ..0..0..0..0..0..0..1..1..1..1..0..0....1..1..2..2..1..1..1..1..2..2..1..1
%K nonn
%O 1,1
%A _R. H. Hardin_ Oct 23 2011
