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 A219417 #7 Feb 21 2025 15:20:12 %S A219417 1,7,93,3617,372560,104434119,80311501599,170240798669115, %T A219417 992546861505827096,15854777538297903063593 %N A219417 Unchanging value maps: number of n X n binary arrays indicating the locations of corresponding elements unequal to no horizontal or antidiagonal neighbor in a random 0..2 n X n array. %C A219417 Diagonal of A219421. %e A219417 Some solutions for n=3 %e A219417 ..1..1..0....0..0..0....1..1..0....0..0..1....0..0..0....0..0..1....0..0..0 %e A219417 ..0..0..0....0..1..0....0..0..0....1..1..1....1..0..1....0..0..1....1..0..1 %e A219417 ..1..0..1....0..0..1....0..1..1....1..0..0....1..1..1....1..0..0....0..0..0 %Y A219417 Cf. A219421. %K A219417 nonn %O A219417 1,2 %A A219417 _R. H. Hardin_, Nov 19 2012