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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A220578 Equals one maps: number of nX7 binary arrays indicating the locations of corresponding elements equal to exactly one of their horizontal and antidiagonal neighbors in a random 0..1 nX7 array.

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%I A220578 #5 Jul 23 2025 01:14:41
%S A220578 64,5240,436288,33180533,2449921734,178051989526,12835487766480
%N A220578 Equals one maps: number of nX7 binary arrays indicating the locations of corresponding elements equal to exactly one of their horizontal and antidiagonal neighbors in a random 0..1 nX7 array.
%C A220578 Column 7 of A220579
%e A220578 Some solutions for n=3
%e A220578 ..0..0..0..0..0..1..0....0..0..0..1..0..0..1....0..0..1..0..0..1..0
%e A220578 ..0..1..0..0..1..0..1....0..0..1..1..0..1..1....0..1..0..1..0..0..1
%e A220578 ..1..1..1..0..1..0..0....1..1..1..0..1..0..0....1..0..1..0..0..0..0
%K A220578 nonn
%O A220578 1,1
%A A220578 _R. H. Hardin_ Dec 16 2012

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