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.
%I A222762 #7 Jul 23 2025 03:01:53 %S A222762 1,3,13,465,19766,4479721,1139211468,1529339764557,2262949907256195, %T A222762 17477638597595547101,147986778995780201368346, %U A222762 6492535454463031607390365256 %N A222762 Number of n X n 0..1 arrays with exactly floor(n X n/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..1 order. %C A222762 Diagonal of A222769 %e A222762 Some solutions for n=3 %e A222762 ..0..0..0....0..0..0....0..0..1....0..0..0....0..1..0....0..0..0....0..1..1 %e A222762 ..0..0..1....1..1..1....0..1..1....0..0..1....1..1..1....0..0..1....0..1..1 %e A222762 ..0..1..1....1..1..1....1..1..1....0..0..1....1..1..1....1..0..0....1..1..1 %K A222762 nonn %O A222762 1,2 %A A222762 _R. H. Hardin_ Mar 05 2013