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 A221243 #5 Sep 13 2023 02:18:20 %S A221243 8,3864,1337130,438377904,142283547000,46087307409528, %T A221243 14921719105582926,4830735371570137800 %N A221243 Number of n X 5 arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor. %C A221243 Column 5 of A221245. %e A221243 Some solutions for n=3 %e A221243 ..0..0..0..2..2....0..0..2..2..2....0..0..4..1..0....0..1..0..2..1 %e A221243 ..0..6..1..0..1....0..1..1..1..0....0..4..1..0..1....0..2..1..1..2 %e A221243 ..0..0..2..1..0....0..3..1..2..0....0..2..0..2..0....0..0..2..3..0 %Y A221243 Cf. A221245. %K A221243 nonn %O A221243 1,1 %A A221243 _R. H. Hardin_, Jan 06 2013