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 A303522 #4 Apr 25 2018 12:38:59 %S A303522 8,31,80,359,1758,9225,56046,366415,2519399,17926787,129675215, %T A303522 946882296,6952003074,51182425206,377395379937,2785188408332, %U A303522 20564328532736,151875658775227,1121831718798095,8287122669326048,61221054216532119 %N A303522 Number of nX5 0..1 arrays with every element equal to 0, 1, 3, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A303522 Column 5 of A303525. %H A303522 R. H. Hardin, <a href="/A303522/b303522.txt">Table of n, a(n) for n = 1..210</a> %e A303522 Some solutions for n=5 %e A303522 ..0..1..0..0..0. .0..1..0..0..0. .0..1..0..0..1. .0..0..1..0..1 %e A303522 ..1..1..0..1..0. .0..1..1..1..0. .0..1..1..1..1. .0..1..0..0..1 %e A303522 ..0..1..0..1..0. .1..1..1..1..1. .0..1..0..0..1. .0..1..0..0..0 %e A303522 ..0..1..0..1..0. .0..1..0..1..0. .0..0..0..0..0. .0..1..0..0..0 %e A303522 ..0..1..1..1..0. .0..1..1..0..0. .0..1..0..0..1. .0..0..0..0..1 %Y A303522 Cf. A303525. %K A303522 nonn %O A303522 1,1 %A A303522 _R. H. Hardin_, Apr 25 2018