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 A303101 #4 Apr 18 2018 12:38:24 %S A303101 8,2208,128921,8650205,568099880,37220475492,2441756629583, %T A303101 160164698180399,10505922762123798,689141410588573095, %U A303101 45204400412352498100,2965196935043545360686,194503015320143538663000 %N A303101 Number of nX7 0..1 arrays with every element equal to 1, 2, 3, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A303101 Column 7 of A303102. %H A303101 R. H. Hardin, <a href="/A303101/b303101.txt">Table of n, a(n) for n = 1..210</a> %e A303101 Some solutions for n=5 %e A303101 ..0..0..1..1..0..1..1. .0..0..1..1..1..1..0. .0..0..1..0..0..0..0 %e A303101 ..0..0..1..0..0..1..0. .0..0..1..1..0..0..0. .0..0..1..1..0..1..0 %e A303101 ..0..0..0..1..1..0..1. .0..0..0..1..0..0..1. .0..0..0..1..1..0..0 %e A303101 ..0..0..1..1..0..0..0. .0..0..1..0..1..1..1. .0..0..1..0..0..1..1 %e A303101 ..0..0..1..1..1..1..1. .0..0..1..1..1..0..0. .0..0..1..1..0..1..1 %Y A303101 Cf. A303102. %K A303101 nonn %O A303101 1,1 %A A303101 _R. H. Hardin_, Apr 18 2018