A220341 - OEIS

%I #3 Dec 11 2012 07:43:29

%S 4,89,3281,60003,1022813,16673578

%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..3 nX4 array

%C Column 4 of A220342

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Dec 11 2012