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Equals two maps: number of nX4 binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and vertical neighbors in a random 0..2 nX4 array
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%I #3 Dec 13 2012 06:49:06

%S 4,94,2095,39780,722126,12480964,209958887,3466406061

%N Equals two maps: number of nX4 binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and vertical neighbors in a random 0..2 nX4 array

%C Column 4 of A220375

%e Some solutions for n=3

%e ..0..1..1..1....0..0..1..1....0..0..0..0....1..0..0..1....0..0..0..0

%e ..0..1..0..1....1..1..1..0....1..0..1..0....0..0..0..1....1..1..1..1

%e ..0..0..1..1....0..0..0..0....1..0..1..1....1..0..1..0....0..1..1..0

%K nonn

%O 1,1

%A _R. H. Hardin_ Dec 13 2012