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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.

A221065 Sum of neighbor maps: number of n X n binary arrays indicating the locations of corresponding elements equal to the sum mod 4 of their king-move neighbors in a random 0..3 n X n array.

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%I A221065 #7 Jul 23 2025 01:40:14
%S A221065 2,8,512,65536,17530176,68719476736,562949953421312
%N A221065 Sum of neighbor maps: number of n X n binary arrays indicating the locations of corresponding elements equal to the sum mod 4 of their king-move neighbors in a random 0..3 n X n array.
%C A221065 Diagonal of A221072
%e A221065 Some solutions for n=3
%e A221065 ..0..1..0....1..0..1....1..1..1....0..0..1....0..1..1....1..0..0....0..0..0
%e A221065 ..1..1..1....1..1..0....0..1..0....0..1..1....1..1..0....0..1..1....1..1..0
%e A221065 ..1..0..0....1..0..1....0..1..1....1..1..1....0..1..0....1..0..0....1..0..1
%K A221065 nonn
%O A221065 1,1
%A A221065 _R. H. Hardin_ Dec 31 2012

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