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 A183522 #7 Jul 22 2025 09:03:38 %S A183522 13,309,2233,27609,371691,4406933,56562977,728459961,9260503697, %T A183522 118800214951,1524147275433,19534446701521,250583781238959, %U A183522 3214379129443263,41229745589418633,528882044555348133 %N A183522 Number of nX5 0..2 arrays with each element equal to either the sum mod 3 of its horizontal and vertical neighbors or the sum mod 3 of its diagonal and antidiagonal neighbors. %C A183522 Column 5 of A183526 %H A183522 R. H. Hardin, <a href="/A183522/b183522.txt">Table of n, a(n) for n = 1..21</a> %e A183522 Some solutions for 3X5 %e A183522 ..2..2..1..0..2....0..2..0..0..0....2..1..1..2..1....0..1..0..0..1 %e A183522 ..0..2..0..2..0....1..2..0..1..0....1..0..0..1..2....2..1..0..2..1 %e A183522 ..1..1..1..2..2....0..2..0..0..1....0..0..0..0..2....0..1..0..0..1 %K A183522 nonn %O A183522 1,1 %A A183522 _R. H. Hardin_ Jan 05 2011