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 A302307 #4 Apr 05 2018 09:37:11 %S A302307 13,113,121,663,1595,5715,18990,73663,312122,1468425,7435015,39732589, %T A302307 220413622,1252325938,7234253383,42220737525,248052641109, %U A302307 1463694696334,8660691810640,51336560128881,304650450122309,1809254624278226 %N A302307 Number of nX6 0..1 arrays with every element equal to 0, 1, 3 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A302307 Column 6 of A302309. %H A302307 R. H. Hardin, <a href="/A302307/b302307.txt">Table of n, a(n) for n = 1..210</a> %e A302307 Some solutions for n=5 %e A302307 ..0..1..0..1..1..0. .0..0..0..1..0..1. .0..1..1..0..0..1. .0..0..0..1..1..1 %e A302307 ..0..1..0..1..0..1. .0..1..0..1..0..1. .0..1..0..1..0..1. .0..1..0..1..0..1 %e A302307 ..0..1..0..1..0..1. .0..1..0..1..0..1. .0..1..0..1..0..1. .1..1..0..1..0..0 %e A302307 ..0..1..0..1..0..0. .0..1..0..1..0..1. .0..1..0..1..0..1. .0..1..0..1..0..1 %e A302307 ..0..1..0..1..0..1. .0..1..0..0..1..1. .0..0..0..1..1..1. .0..1..0..1..0..1 %Y A302307 Cf. A302309. %K A302307 nonn %O A302307 1,1 %A A302307 _R. H. Hardin_, Apr 05 2018