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 A269151 #6 Mar 15 2023 15:01:35 %S A269151 5832,2270592,642676704,167970539096,42119837369168,10275566914040000, %T A269151 2456638851763181776,578202261783376052264,134401513805944458613328, %U A269151 30926068491391277680083776,7056680383368519798619918656 %N A269151 Number of n X 7 0..3 arrays with some element plus some horizontally, antidiagonally or vertically adjacent neighbor totalling three exactly once. %C A269151 Column 7 of A269152. %H A269151 R. H. Hardin, <a href="/A269151/b269151.txt">Table of n, a(n) for n = 1..210</a> %e A269151 Some solutions for n=1 %e A269151 ..2..2..0..1..2..3..1. .0..3..3..3..1..3..3. .0..2..3..2..2..1..3 %Y A269151 Cf. A269152. %K A269151 nonn %O A269151 1,1 %A A269151 _R. H. Hardin_, Feb 20 2016