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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.

A222282 Number of n X n 0..1 arrays with exactly floor(n X n/2) elements unequal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..1 order.

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%I A222282 #7 Jul 23 2025 02:28:10
%S A222282 1,0,4,208,6582,1249354,262048125,288902941734,350421368609396
%N A222282 Number of n X n 0..1 arrays with exactly floor(n X n/2) elements unequal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..1 order.
%C A222282 Diagonal of A222290
%e A222282 Some solutions for n=4
%e A222282 ..0..0..0..1....0..0..0..0....0..0..1..1....0..0..0..1....0..0..0..0
%e A222282 ..0..0..1..1....0..0..0..0....0..1..1..1....0..0..0..1....0..0..1..0
%e A222282 ..0..0..1..1....0..0..1..0....0..0..1..1....0..0..1..1....0..0..0..1
%e A222282 ..0..1..1..1....0..1..1..0....0..0..1..1....0..0..1..1....0..0..0..1
%K A222282 nonn
%O A222282 1,3
%A A222282 _R. H. Hardin_ Feb 14 2013

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