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 A302217 #4 Apr 03 2018 12:05:13 %S A302217 64,21,1065,172,6423,8756,55922,465040,1136003,19265064,60547641, %T A302217 699553699,3796928584,26139308319,214325335931,1151196050162, %U A302217 10992872734396,60033419186727,538343914163895,3376563558675197 %N A302217 Number of 7Xn 0..1 arrays with every element equal to 0, 2 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A302217 Row 7 of A302212. %H A302217 R. H. Hardin, <a href="/A302217/b302217.txt">Table of n, a(n) for n = 1..111</a> %e A302217 Some solutions for n=5 %e A302217 ..0..1..1..0..1. .0..0..0..1..1. .0..1..1..0..0. .0..0..1..1..0 %e A302217 ..1..1..0..0..0. .1..0..1..1..1. .1..1..0..0..1. .1..0..0..1..1 %e A302217 ..0..0..1..1..1. .1..0..0..1..0. .0..1..1..0..0. .1..0..0..1..0 %e A302217 ..0..0..1..1..0. .0..0..1..1..0. .0..1..1..0..0. .1..0..0..1..1 %e A302217 ..1..0..0..1..0. .0..0..1..1..0. .0..1..0..0..1. .1..0..1..1..1 %e A302217 ..1..0..1..1..1. .0..0..1..1..0. .1..1..0..0..1. .1..0..0..1..0 %e A302217 ..0..0..0..1..0. .1..0..0..1..1. .1..1..1..0..0. .0..0..0..1..0 %Y A302217 Cf. A302212. %K A302217 nonn %O A302217 1,1 %A A302217 _R. H. Hardin_, Apr 03 2018