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%I #4 Dec 09 2015 09:57:41
%S 2,18,250,3358,42282,502154,5710302,62782966,672520310,7056533978,
%T 72819524370,741279145398,7460955607878,74381377429158,
%U 735539563061590,7222916531541006,70499118369836786,684459097597365542
%N Number of nX2 0..n+2-2 arrays with each element differing from its horizontal and vertical neighbors by one or two.
%C Column 2 of A265458.
%H R. H. Hardin, <a href="/A265452/b265452.txt">Table of n, a(n) for n = 1..210</a>
%e Some solutions for n=4
%e ..1..2....3..1....1..0....4..3....3..2....2..3....2..0....1..3....4..2....3..2
%e ..2..3....4..2....0..2....2..1....2..1....3..4....0..1....2..4....3..1....1..0
%e ..1..2....2..1....2..3....1..3....1..2....4..2....1..2....1..2....1..3....0..1
%e ..3..4....1..3....3..1....0..1....3..4....2..1....2..3....2..1....3..1....2..3
%Y Cf. A265458.
%K nonn
%O 1,1
%A _R. H. Hardin_, Dec 09 2015