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 A302875 #4 Apr 15 2018 10:32:58 %S A302875 13,113,241,1442,7580,45897,320405,2489823,20679119,181479109, %T A302875 1638029668,15055216000,140041815820,1311377207833,12333793776935, %U A302875 116324158971711,1098943034315150,10393405509745294,98366682504010661,931394618765660697 %N A302875 Number of nX6 0..1 arrays with every element equal to 0, 1, 3, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A302875 Column 6 of A302877. %H A302875 R. H. Hardin, <a href="/A302875/b302875.txt">Table of n, a(n) for n = 1..210</a> %e A302875 Some solutions for n=5 %e A302875 ..0..1..0..1..0..1. .0..1..1..0..1..1. .0..1..1..0..1..0. .0..0..0..1..1..1 %e A302875 ..0..1..1..1..0..1. .1..0..1..0..0..0. .1..0..1..0..1..0. .0..1..0..1..0..1 %e A302875 ..0..0..0..1..0..1. .1..0..1..0..1..0. .1..0..1..0..1..0. .0..1..0..1..0..1 %e A302875 ..0..1..1..1..1..0. .1..0..1..0..1..1. .0..0..1..1..0..0. .1..1..0..1..0..1 %e A302875 ..0..1..0..0..1..0. .1..0..1..0..1..0. .1..0..1..0..1..0. .0..1..0..1..0..1 %Y A302875 Cf. A302877. %K A302875 nonn %O A302875 1,1 %A A302875 _R. H. Hardin_, Apr 15 2018