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 A196944 #8 Jun 02 2025 04:38:00 %S A196944 1,11,210,18060,5039158,4998342821,17331168379114,210721221635883326 %N A196944 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,1,0,2,3 for x=0,1,2,3,4. %C A196944 Every 0 is next to 0 4's, every 1 is next to 1 1's, every 2 is next to 2 0's, every 3 is next to 3 2's, every 4 is next to 4 3's %C A196944 Diagonal of A196950 %e A196944 Some solutions for n=4 %e A196944 ..0..0..0..2....0..0..0..0....0..1..1..0....0..0..1..1....2..0..1..1 %e A196944 ..0..1..1..0....0..0..1..1....0..0..2..1....1..1..2..0....0..0..0..2 %e A196944 ..0..0..2..0....1..0..0..0....0..0..0..1....0..0..0..1....0..0..0..0 %e A196944 ..2..0..2..0....1..0..1..1....1..1..2..0....2..0..0..1....0..0..1..1 %K A196944 nonn %O A196944 1,2 %A A196944 _R. H. Hardin_ Oct 08 2011