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 A183479 #7 Jul 22 2025 08:59:21 %S A183479 13,495,2925,40073,706473,7773025,107741253,1577932971,20728674493, %T A183479 287526589977,4036331530635,55313628172919,767230355186961, %U A183479 10669808831015745,147604547979187367,2047336009619708185 %N A183479 Number of nX5 0..2 arrays with every element equal to either the sum mod 3 of its vertical neighbors or the sum mod 3 of its horizontal neighbors. %C A183479 Column 5 of A183483 %H A183479 R. H. Hardin, <a href="/A183479/b183479.txt">Table of n, a(n) for n = 1..131</a> %e A183479 Some solutions for 4X5 %e A183479 ..1..1..0..1..1....1..0..0..0..0....1..1..0..0..0....2..2..0..1..1 %e A183479 ..0..0..0..0..0....1..0..0..2..2....2..0..0..0..2....0..0..0..0..0 %e A183479 ..0..2..1..0..1....0..0..0..0..0....1..2..0..0..2....1..2..2..2..0 %e A183479 ..0..2..1..0..1....0..0..2..2..0....2..2..0..0..0....1..2..2..2..0 %K A183479 nonn %O A183479 1,1 %A A183479 _R. H. Hardin_ Jan 05 2011