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%I A198531 #4 Mar 31 2012 12:36:34
%S A198531 492,74582,12510524,2223874372,411119156729,77956630302044,
%T A198531 15021391650662681,2923455266600557870,572454626428774679082,
%U A198531 112514115501137650870546,22164495447174669745358050
%N A198531 Number of 2nX8 0..2 arrays with values 0..2 introduced in row major order and each element equal to exactly one horizontal or vertical neighbor
%C A198531 Column 4 of A198532
%e A198531 Some solutions for n=3
%e A198531 ..0..0..1..1..2..1..0..1....0..0..1..1..2..1..2..2....0..0..1..1..2..2..0..0
%e A198531 ..1..1..0..0..2..1..0..1....1..1..0..0..2..1..0..0....1..1..0..0..1..1..2..2
%e A198531 ..0..0..2..2..1..2..1..0....0..0..2..2..0..0..1..1....0..0..1..1..0..0..1..1
%e A198531 ..1..1..0..0..1..2..1..0....1..1..0..0..1..1..2..2....1..1..0..0..1..1..0..0
%e A198531 ..0..0..1..2..0..1..0..1....0..0..1..1..0..0..1..1....2..2..1..1..2..2..1..1
%e A198531 ..2..2..1..2..0..1..0..1....1..1..0..0..1..1..2..2....1..1..0..0..1..1..2..2
%K A198531 nonn
%O A198531 1,1
%A A198531 _R. H. Hardin_ Oct 26 2011

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