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 A269141 #4 Feb 20 2016 06:18:29 %S A269141 2592,408596,54199284,6766301156,815458664276,95884587957284, %T A269141 11067174233536260,1259009098075800036,141573069581490127524, %U A269141 15769412440038867100180,1742724618979587037657388 %N A269141 Number of nX6 0..3 arrays with some element plus some horizontally, antidiagonally or vertically adjacent neighbor totalling three no more than once. %C A269141 Column 6 of A269143. %H A269141 R. H. Hardin, <a href="/A269141/b269141.txt">Table of n, a(n) for n = 1..210</a> %e A269141 Some solutions for n=2 %e A269141 ..2..0..2..3..2..2. .0..2..3..1..0..0. .0..2..0..1..3..3. .1..1..1..1..1..1 %e A269141 ..0..1..3..3..2..3. .0..2..1..1..0..0. .0..2..1..3..3..1. .0..1..3..3..1..3 %Y A269141 Cf. A269143. %K A269141 nonn %O A269141 1,1 %A A269141 _R. H. Hardin_, Feb 20 2016