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A221294 Equals two maps: number of 6Xn binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and antidiagonal neighbors in a random 0..3 6Xn array.

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%I A221294 #5 Jul 23 2025 01:49:43
%S A221294 1,351,19996,1686304,143511784,10344276279
%N A221294 Equals two maps: number of 6Xn binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and antidiagonal neighbors in a random 0..3 6Xn array.
%C A221294 Row 6 of A221290
%e A221294 Some solutions for n=3
%e A221294 ..0..1..0....0..0..0....0..0..1....0..0..1....0..0..1....0..1..1....0..1..0
%e A221294 ..0..1..1....0..0..0....0..1..0....1..0..1....0..1..0....0..1..0....1..1..0
%e A221294 ..1..0..1....1..0..0....0..0..0....0..0..0....1..1..0....0..1..1....0..0..1
%e A221294 ..0..0..0....0..1..0....1..1..0....0..0..1....0..0..0....0..1..0....0..1..0
%e A221294 ..0..1..1....0..0..0....0..1..1....1..0..1....1..1..0....1..1..0....1..1..0
%e A221294 ..1..1..0....1..1..0....1..1..0....0..1..0....1..1..0....0..0..0....1..0..0
%K A221294 nonn
%O A221294 1,2
%A A221294 _R. H. Hardin_ Jan 09 2013

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