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A220961 Equals two maps: number of 4Xn binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal, diagonal and antidiagonal neighbors in a random 0..3 4Xn array 0

%I #3 Dec 26 2012 21:13:49

%S 1,94,1224,33708,627760,11214779,190881959

%N Equals two maps: number of 4Xn binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal, diagonal and antidiagonal neighbors in a random 0..3 4Xn array

%C Row 4 of A220959

%e Some solutions for n=3

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

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Dec 26 2012

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Last modified April 23 10:29 EDT 2024. Contains 371905 sequences. (Running on oeis4.)