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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.

A221025 Sum of neighbor maps: log base 2 of the number of n X n binary arrays indicating the locations of corresponding elements equal to the sum mod 2 of their horizontal, vertical and antidiagonal neighbors in a random 0..1 n X n array.

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%I A221025 #7 Jul 23 2025 01:37:28
%S A221025 1,3,7,16,24,33,45,63,81,100
%N A221025 Sum of neighbor maps: log base 2 of the number of n X n binary arrays indicating the locations of corresponding elements equal to the sum mod 2 of their horizontal, vertical and antidiagonal neighbors in a random 0..1 n X n array.
%C A221025 Diagonal of A221028
%e A221025 Some solutions for n=3
%e A221025 ..0..1..0....0..0..0....1..1..0....1..0..1....1..1..1....0..1..0....1..0..1
%e A221025 ..0..0..1....0..1..0....1..0..1....1..0..0....1..1..1....0..1..1....0..1..0
%e A221025 ..0..0..0....0..0..0....0..1..1....0..1..1....1..1..1....0..0..0....0..0..1
%K A221025 nonn
%O A221025 1,2
%A A221025 _R. H. Hardin_ Dec 29 2012

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