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 A196293 #8 Jun 02 2025 04:20:14 %S A196293 1,9,58,2161,160800,29726608,14372583192,17833080104711 %N A196293 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 3,0,1,4,2 for x=0,1,2,3,4. %C A196293 Every 0 is next to 0 3's, every 1 is next to 1 0's, every 2 is next to 2 1's, every 3 is next to 3 4's, every 4 is next to 4 2's %C A196293 Diagonal of A196300 %e A196293 Some solutions for n=4 %e A196293 ..0..1..1..0....0..1..1..0....0..0..0..0....0..1..1..0....0..0..1..1 %e A196293 ..0..1..1..0....1..1..2..0....0..2..1..1....1..1..1..2....1..1..2..0 %e A196293 ..0..2..1..0....1..0..0..0....0..1..1..1....2..0..0..1....2..1..0..0 %e A196293 ..0..0..1..1....2..1..1..1....1..1..0..0....1..0..0..1....0..1..1..1 %K A196293 nonn %O A196293 1,2 %A A196293 _R. H. Hardin_ Sep 30 2011