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Equals two maps: number of n X n binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and antidiagonal neighbors in a random 0..3 n X n array
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%I #5 Dec 18 2015 18:18:25

%S 1,4,92,9107,4983598,10344276279

%N Equals two maps: number of n X n binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and antidiagonal neighbors in a random 0..3 n X n array

%C Diagonal of A221290

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Jan 09 2013