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 A303247 #4 Apr 20 2018 10:59:20 %S A303247 64,21,1465,458,23995,41878,686376,4288552,44547581,435326091, %T A303247 4420070682,46247239309,488935478096,5159966424970,55400725550050, %U A303247 589318077173963,6332575656503077,67765552380120662,727276471899440959 %N A303247 Number of 7Xn 0..1 arrays with every element equal to 0, 2, 3, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A303247 Row 7 of A303242. %H A303247 R. H. Hardin, <a href="/A303247/b303247.txt">Table of n, a(n) for n = 1..210</a> %e A303247 Some solutions for n=5 %e A303247 ..0..1..1..0..0. .0..0..1..1..1. .0..0..1..1..0. .0..0..0..1..1 %e A303247 ..1..1..1..0..0. .1..0..0..1..1. .0..0..1..1..1. .1..0..1..1..1 %e A303247 ..0..0..0..1..1. .0..0..1..1..1. .0..0..1..0..1. .0..0..1..1..1 %e A303247 ..1..0..0..1..0. .0..0..1..1..1. .1..1..0..1..0. .1..0..0..1..1 %e A303247 ..1..0..1..1..1. .0..0..1..1..0. .1..1..0..0..0. .0..0..1..1..1 %e A303247 ..0..0..0..1..1. .1..0..1..1..1. .0..0..0..0..0. .0..0..1..1..1 %e A303247 ..1..0..1..1..1. .0..0..0..1..0. .1..0..1..0..0. .1..0..0..1..1 %Y A303247 Cf. A303242. %K A303247 nonn %O A303247 1,1 %A A303247 _R. H. Hardin_, Apr 20 2018