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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.

A221071 Sum of neighbor maps: number of nX7 binary arrays indicating the locations of corresponding elements equal to the sum mod 4 of their king-move neighbors in a random 0..3 nX7 array.

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%I A221071 #5 Jul 23 2025 01:40:43
%S A221071 128,1364,2097152,268435456,25241048576,4398046511104,562949953421312,
%T A221071 70342550622109696
%N A221071 Sum of neighbor maps: number of nX7 binary arrays indicating the locations of corresponding elements equal to the sum mod 4 of their king-move neighbors in a random 0..3 nX7 array.
%C A221071 Column 7 of A221072
%e A221071 Some solutions for n=3
%e A221071 ..0..0..0..0..1..1..1....0..0..1..0..0..1..1....0..0..0..0..1..1..1
%e A221071 ..0..0..1..0..0..0..0....0..0..1..0..0..1..0....0..0..0..0..1..0..0
%e A221071 ..0..0..0..0..0..0..0....0..1..1..1..0..0..1....0..1..0..0..0..1..0
%K A221071 nonn
%O A221071 1,1
%A A221071 _R. H. Hardin_ Dec 31 2012

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