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 A303414 #4 Apr 23 2018 10:44:45 %S A303414 0,421,10384,15852,115770,2158662,24386918,158640643,1293822589, %T A303414 14788283853,149020593141,1275569366713,11671994401668, %U A303414 115222219445362,1107799093548111,10250710845474527,96126433140397235,918622040686576956 %N A303414 Number of 7Xn 0..1 arrays with every element equal to 1, 2, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A303414 Row 7 of A303410. %H A303414 R. H. Hardin, <a href="/A303414/b303414.txt">Table of n, a(n) for n = 1..210</a> %e A303414 Some solutions for n=5 %e A303414 ..0..1..1..1..0. .0..1..0..1..0. .0..0..1..0..0. .0..0..0..0..0 %e A303414 ..0..0..0..0..0. .1..0..0..0..1. .1..1..1..1..0. .0..0..0..0..0 %e A303414 ..0..0..0..0..0. .0..0..0..0..0. .1..0..1..0..1. .1..1..0..1..0 %e A303414 ..0..1..1..1..0. .1..1..0..1..1. .0..1..1..1..1. .0..0..1..0..0 %e A303414 ..1..0..0..0..0. .0..0..0..0..0. .1..0..1..0..1. .0..1..0..1..1 %e A303414 ..1..0..1..0..0. .1..0..0..0..0. .1..1..1..1..0. .1..0..0..0..0 %e A303414 ..1..1..1..1..0. .0..1..0..1..1. .1..0..0..0..1. .0..1..0..1..1 %Y A303414 Cf. A303410. %K A303414 nonn %O A303414 1,2 %A A303414 _R. H. Hardin_, Apr 23 2018