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 A302639 #4 Apr 10 2018 19:35:28 %S A302639 32,42,82,248,719,2262,6460,19799,59002,179668,535412,1618765,4863776, %T A302639 14679083,44118667,132955659,400197277,1205668487,3629343498, %U A302639 10930567358,32912798461,99120195646,298461584492,898783501386,2706487328339 %N A302639 Number of 6Xn 0..1 arrays with every element equal to 0, 1, 3 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A302639 Row 6 of A302635. %H A302639 R. H. Hardin, <a href="/A302639/b302639.txt">Table of n, a(n) for n = 1..210</a> %H A302639 R. H. Hardin, <a href="/A302639/a302639.txt">Empirical recurrence of order 81</a> %F A302639 Empirical recurrence of order 81 (see link above) %e A302639 Some solutions for n=5 %e A302639 ..0..1..0..0..1. .0..1..1..0..1. .0..1..0..1..0. .0..1..0..0..1 %e A302639 ..0..1..0..1..0. .1..0..1..0..1. .1..1..0..0..0. .1..1..0..1..0 %e A302639 ..0..1..0..1..0. .1..0..1..0..0. .0..1..0..1..0. .0..1..0..1..0 %e A302639 ..0..1..0..1..0. .1..0..1..0..1. .0..1..0..1..0. .0..1..0..1..0 %e A302639 ..0..1..0..1..0. .1..0..1..1..1. .0..1..1..1..0. .0..1..0..1..0 %e A302639 ..0..0..1..1..0. .1..0..1..0..1. .0..1..0..1..0. .0..1..0..0..1 %Y A302639 Cf. A302635. %K A302639 nonn %O A302639 1,1 %A A302639 _R. H. Hardin_, Apr 10 2018