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 A303089 #4 Apr 18 2018 12:24:53 %S A303089 64,21,5472,4182,615471,4862916,266882021,5924274499,231312682374, %T A303089 7326136324116,265724475520255,9228359438652216,330920558831885611, %U A303089 11758758712910364555,421228402696480451106,15057312628686341086187 %N A303089 Number of 7Xn 0..1 arrays with every element equal to 0, 2, 3, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A303089 Row 7 of A303084. %H A303089 R. H. Hardin, <a href="/A303089/b303089.txt">Table of n, a(n) for n = 1..210</a> %e A303089 Some solutions for n=5 %e A303089 ..0..0..0..0..1. .0..0..0..0..0. .0..0..0..1..1. .0..0..0..0..1 %e A303089 ..0..0..1..0..0. .1..0..0..0..0. .0..0..1..1..1. .0..0..0..0..1 %e A303089 ..0..0..1..0..0. .1..0..1..0..1. .1..0..0..1..0. .1..0..1..0..0 %e A303089 ..1..1..0..1..1. .0..0..0..0..0. .0..0..0..1..1. .0..0..0..0..0 %e A303089 ..1..1..0..1..1. .0..0..0..0..0. .0..1..1..1..0. .1..1..0..1..1 %e A303089 ..1..1..1..1..1. .1..1..1..1..1. .0..0..1..1..1. .0..1..1..1..0 %e A303089 ..1..1..0..1..0. .0..1..1..1..1. .0..0..0..1..1. .0..1..1..1..0 %Y A303089 Cf. A303084. %K A303089 nonn %O A303089 1,1 %A A303089 _R. H. Hardin_, Apr 18 2018