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%I #7 Mar 31 2012 12:36:03
%S 3,61,393,2398,15782,98975,649826,4143707,26679121,171597547,
%T 1102725806,7092378045,45590856963,293158517847,1884832244162,
%U 12118696565347,77918494954731,500981651046567,3221109348385647,20710370917938021
%N Half the number of nX5 binary arrays with every element equal to exactly one or two of its horizontal and vertical neighbors
%C Column 5 of A185835
%H R. H. Hardin, <a href="/A185831/b185831.txt">Table of n, a(n) for n = 1..200</a>
%e Some solutions for 4X5 with a(1,1)=0
%e ..0..0..1..0..0....0..1..1..0..1....0..0..1..1..1....0..1..1..0..0
%e ..1..0..1..0..0....0..0..1..0..1....0..1..1..0..1....0..0..1..0..1
%e ..1..0..1..1..1....1..1..0..0..1....1..0..0..0..1....1..0..0..0..1
%e ..1..0..0..0..1....0..0..0..1..1....1..1..1..1..1....1..1..1..1..1
%K nonn
%O 1,1
%A _R. H. Hardin_ Feb 05 2011
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