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%I #5 Mar 31 2012 12:36:34
%S 14,1985,309770,49726877,8055413256,1308245895665,212660032469362,
%T 34578446232234461,5622954055105266638,914399588312051428232,
%U 148700162991801408836106,24181772212240990503470021
%N Number of 2nX10 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 5 of A198604
%H R. H. Hardin, <a href="/A198601/b198601.txt">Table of n, a(n) for n = 1..16</a>
%e Some solutions for n=3
%e ..0..0..1..1..2..2..3..3..2..2....0..0..0..0..1..1..2..2..0..0
%e ..0..0..1..1..2..2..3..3..2..2....0..1..1..0..1..1..2..2..0..0
%e ..1..1..3..3..3..3..1..1..0..0....0..1..1..0..0..0..0..0..1..1
%e ..1..1..3..0..0..3..1..1..0..0....0..0..0..1..1..3..3..0..1..1
%e ..0..0..3..0..0..3..2..2..1..1....3..3..0..1..1..3..3..0..2..2
%e ..0..0..3..3..3..3..2..2..1..1....3..3..0..0..0..0..0..0..2..2
%K nonn
%O 1,1
%A _R. H. Hardin_ Oct 27 2011