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 A302223 #6 Sep 04 2022 15:15:56 %S A302223 8,1934,15569,251254,3018243,42508145,553097760,7403262824, %T A302223 97939043966,1301831347709,17275065368012,229303687769069, %U A302223 3043569120232324,40395942785616147,536209245725631300,7116991167351864042 %N A302223 Number of n X 7 0..1 arrays with every element equal to 1, 2 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A302223 Column 7 of A302224. %H A302223 R. H. Hardin, <a href="/A302223/b302223.txt">Table of n, a(n) for n = 1..210</a> %e A302223 Some solutions for n=5 %e A302223 ..0..0..1..1..0..0..1. .0..0..1..1..0..0..1. .0..0..1..1..1..1..0 %e A302223 ..0..1..1..0..1..1..0. .0..1..0..1..0..1..1. .0..1..0..0..0..0..1 %e A302223 ..0..0..1..0..1..1..0. .0..1..0..1..0..1..1. .0..1..1..0..1..1..0 %e A302223 ..0..1..1..0..0..0..1. .0..0..1..0..0..0..1. .0..0..1..0..1..0..0 %e A302223 ..0..0..1..1..1..1..0. .1..1..1..0..1..1..1. .1..1..0..0..1..1..1 %Y A302223 Cf. A302224. %K A302223 nonn %O A302223 1,1 %A A302223 _R. H. Hardin_, Apr 03 2018