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%I #6 Mar 31 2012 12:36:34
%S 5,485,81440,14520192,2606019472,468268681671,84165911962889,
%T 15129042589276259,2719545932661264380,488859618202335884730,
%U 87876498667057316198136,15796525069912515393284021
%N Number of 2nX8 0..4 arrays with values 0..4 introduced in row major order and each element equal to exactly two horizontal and vertical neighbors
%C Column 4 of A198253
%H R. H. Hardin, <a href="/A198249/b198249.txt">Table of n, a(n) for n = 1..51</a>
%e Some solutions for n=3
%e ..0..0..1..1..2..2..3..3....0..0..1..1..2..2..1..1....0..0..1..1..2..2..3..3
%e ..0..0..1..1..2..2..3..3....0..0..1..1..2..2..1..1....0..0..1..1..2..2..3..3
%e ..3..3..2..2..3..3..2..2....1..1..0..0..3..3..2..2....1..1..3..3..4..4..2..2
%e ..3..3..2..2..3..3..2..2....1..1..0..0..3..3..2..2....1..1..3..3..4..4..2..2
%e ..1..1..3..3..2..2..4..4....3..3..2..2..4..4..3..3....3..3..1..1..0..0..4..4
%e ..1..1..3..3..2..2..4..4....3..3..2..2..4..4..3..3....3..3..1..1..0..0..4..4
%K nonn
%O 1,1
%A _R. H. Hardin_ Oct 22 2011
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