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 A302386 #4 Apr 06 2018 12:45:53 %S A302386 0,1172,97160,5421003,404225195,29810775827,2195619257236, %T A302386 161767569162389,11926561967149057,879261959837334277, %U A302386 64822173992483793756,4778918571861830147396,352319630303338775663571 %N A302386 Number of 7Xn 0..1 arrays with every element equal to 1, 2, 3 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A302386 Row 7 of A302381. %H A302386 R. H. Hardin, <a href="/A302386/b302386.txt">Table of n, a(n) for n = 1..210</a> %e A302386 Some solutions for n=5 %e A302386 ..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0 %e A302386 ..0..0..0..1..0. .0..0..0..1..0. .0..0..0..1..0. .0..0..0..1..0 %e A302386 ..1..0..1..1..1. .1..0..1..1..0. .1..0..1..1..0. .1..0..1..1..0 %e A302386 ..0..1..1..0..1. .1..1..0..0..1. .0..1..1..0..0. .0..1..0..0..1 %e A302386 ..1..0..0..0..1. .0..0..1..0..1. .0..1..1..1..0. .1..0..0..0..0 %e A302386 ..0..0..1..1..0. .0..0..1..1..0. .1..0..0..1..0. .0..1..1..0..0 %e A302386 ..0..0..1..0..1. .0..1..0..0..1. .0..0..0..0..1. .0..0..0..1..1 %Y A302386 Cf. A302381. %K A302386 nonn %O A302386 1,2 %A A302386 _R. H. Hardin_, Apr 06 2018