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Equals two maps: number of nX4 binary arrays indicating the locations of corresponding elements equal to exactly two of their king-move neighbors in a random 0..1 nX4 array
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%I #3 Dec 08 2012 14:20:12

%S 4,37,816,7140,64258,660677,6228324,59704733,580593280,5565851685,

%T 53535536290

%N Equals two maps: number of nX4 binary arrays indicating the locations of corresponding elements equal to exactly two of their king-move neighbors in a random 0..1 nX4 array

%C Column 4 of A220247

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Dec 08 2012