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 A207362 #8 Jun 26 2022 12:56:10 %S A207362 2,16,90,784,5856,42849,353808,2792241,21195317,182223001,1372615690, %T A207362 11550015841,91115397450,745461286801,5965914998428,49005684164836, %U A207362 389634565985060,3219980044337424 %N A207362 Number of n X n 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 0 1 1 vertically. %C A207362 Diagonal of A207368. %e A207362 Some solutions for n=4 %e A207362 ..1..1..1..1....1..0..1..0....0..1..0..1....1..1..0..1....1..1..0..1 %e A207362 ..0..0..1..0....0..0..1..0....0..1..0..0....1..0..0..1....0..0..1..0 %e A207362 ..0..0..1..0....0..0..1..0....0..1..0..0....0..1..0..0....0..1..0..1 %e A207362 ..0..0..1..0....0..0..1..0....0..1..0..0....1..0..0..1....0..0..1..0 %Y A207362 Cf. A207368. %K A207362 nonn %O A207362 1,1 %A A207362 _R. H. Hardin_, Feb 17 2012