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 A219404 #7 Jul 23 2025 00:25:24 %S A219404 1,7,181,14737,4560446,5618116265,26219581585508,459750729826328790 %N A219404 Unmatched value maps: number of n X n binary arrays indicating the locations of corresponding elements not equal to any horizontal or antidiagonal neighbor in a random 0..2 n X n array. %C A219404 Diagonal of A219410 %e A219404 Some solutions for n=3 %e A219404 ..1..0..1....1..0..1....0..0..0....1..1..1....1..0..0....0..0..0....0..0..1 %e A219404 ..0..1..0....0..0..0....1..1..1....1..0..0....1..0..1....1..1..1....0..1..0 %e A219404 ..0..0..0....1..0..1....0..0..0....1..0..1....0..0..0....1..0..0....0..0..1 %K A219404 nonn %O A219404 1,2 %A A219404 _R. H. Hardin_ Nov 19 2012