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%I
%S 5,113,2584,59212,1357484,31120632,713445976,16355879648,374961537040,
%T 8596061907680,197066293538400,4517780870646656,103570953858672192,
%U 2374383085485820032,54433167085958461312,1247890324488906825728
%N Number of nX3 0..2 arrays with values 0..2 introduced in row major order and each element equal to no more than two horizontal and vertical neighbors
%C Column 3 of A199655
%H R. H. Hardin, <a href="/A199650/b199650.txt">Table of n, a(n) for n = 1..200</a>
%F Empirical: a(n) = 21*a(n-1) +44*a(n-2) +8*a(n-3) -96*a(n-4) -364*a(n-5) -264*a(n-6) +256*a(n-7) +288*a(n-8) +64*a(n-9) for n>10
%e Some solutions for n=4
%e ..0..0..1....0..0..1....0..1..1....0..1..0....0..0..1....0..0..1....0..1..2
%e ..1..0..1....1..0..2....0..2..2....1..0..1....1..1..1....2..2..0....1..0..1
%e ..0..2..2....1..2..0....1..0..0....0..0..2....1..0..2....2..1..0....1..1..0
%e ..1..2..2....0..0..2....2..2..2....2..2..0....1..0..0....2..0..0....0..0..2
%K nonn
%O 1,1
%A _R. H. Hardin_ Nov 08 2011
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