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A220331 Equals two maps: number of 4 X n binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and antidiagonal neighbors in a random 0..1 4 X n array. 0

%I #5 Sep 03 2022 20:56:15

%S 1,37,508,6657,92093,1335202,18836493,265346645,3750121527

%N Equals two maps: number of 4 X n binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and antidiagonal neighbors in a random 0..1 4 X n array.

%C Row 4 of A220328.

%e Some solutions for n=3

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

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

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

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

%Y Cf. A220328.

%K nonn

%O 1,2

%A _R. H. Hardin_, Dec 10 2012

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Last modified February 29 04:26 EST 2024. Contains 370401 sequences. (Running on oeis4.)