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%I #4 Mar 31 2012 12:36:34
%S 41,15761,6671450,2934981667,1308245895665
%N Number of 2nX12 0..3 arrays with values 0..3 introduced in row major order and each element equal to exactly two horizontal and vertical neighbors
%C Column 6 of A198604
%e Some solutions for n=2
%e ..0..0..0..0..0..0..1..1..0..0..1..1....0..0..1..1..0..0..2..2..2..2..2..2
%e ..0..1..1..2..2..0..1..1..0..0..1..1....0..0..1..1..0..0..2..3..3..1..1..2
%e ..0..1..1..2..2..0..3..3..2..2..0..0....1..1..2..2..3..3..2..3..3..1..1..2
%e ..0..0..0..0..0..0..3..3..2..2..0..0....1..1..2..2..3..3..2..2..2..2..2..2
%K nonn
%O 1,1
%A _R. H. Hardin_ Oct 27 2011
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