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 A221244 #5 Jul 23 2025 01:46:43 %S A221244 16,32400,44315649,56606878084,71306050492681,89545789526100625 %N A221244 Number of nX6 arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor. %C A221244 Column 6 of A221245 %e A221244 Some solutions for n=3 %e A221244 ..0..0..0..0..4..2....0..0..0..2..0..0....0..0..1..0..0..0....0..0..1..1..2..1 %e A221244 ..0..3..1..3..2..0....0..3..4..1..2..0....0..3..1..3..2..3....0..3..0..1..2..2 %e A221244 ..0..0..2..1..0..0....0..0..0..2..3..1....0..0..2..0..3..0....0..0..2..1..2..0 %K A221244 nonn %O A221244 1,1 %A A221244 _R. H. Hardin_ Jan 06 2013