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 A183523 #6 Jul 22 2025 09:03:45 %S A183523 23,911,10003,201833,4406933,89738569,1908431611 %N A183523 Number of nX6 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 A183523 Column 6 of A183526 %e A183523 Some solutions for 3X6 %e A183523 ..2..1..0..0..2..2....1..1..0..1..0..1....0..2..1..1..0..2....0..2..2..0..1..2 %e A183523 ..0..2..0..1..2..1....0..1..1..1..1..0....1..1..2..0..0..2....0..0..0..0..1..1 %e A183523 ..2..1..0..0..2..0....1..1..2..1..1..1....1..2..0..2..2..1....0..1..1..0..2..1 %K A183523 nonn %O A183523 1,1 %A A183523 _R. H. Hardin_ Jan 05 2011