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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.

A220804 Sum of neighbor maps: number of nX5 binary arrays indicating the locations of corresponding elements equal to the sum mod 4 of their horizontal and vertical neighbors in a random 0..3 nX5 array.

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%I A220804 #5 Jul 23 2025 01:30:32
%S A220804 24,928,30766,1048576,33358976,1073741824,34348186888,1099436130304
%N A220804 Sum of neighbor maps: number of nX5 binary arrays indicating the locations of corresponding elements equal to the sum mod 4 of their horizontal and vertical neighbors in a random 0..3 nX5 array.
%C A220804 Column 5 of A220805
%e A220804 Some solutions for n=3
%e A220804 ..1..1..1..1..1....0..0..1..1..0....0..0..1..0..1....0..1..0..0..0
%e A220804 ..0..0..1..1..1....0..0..0..1..1....0..0..1..1..0....1..0..1..0..1
%e A220804 ..0..1..1..0..0....1..1..0..1..0....0..1..0..0..0....1..0..0..0..1
%K A220804 nonn
%O A220804 1,1
%A A220804 _R. H. Hardin_ Dec 21 2012

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