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 A300213 #4 Feb 28 2018 14:21:32 %S A300213 32,2048,86775,4023881,186427449,8664017314,402932952786, %T A300213 18741286700978,871742323938453,40549251015486612,1886161222951010871, %U A300213 87735473878569363763,4081048501162756431234,189831515389760442425217 %N A300213 Number of nX6 0..1 arrays with every element equal to 0, 1, 2, 3, 4, 5, 7 or 8 king-move adjacent elements, with upper left element zero. %C A300213 Column 6 of A300215. %H A300213 R. H. Hardin, <a href="/A300213/b300213.txt">Table of n, a(n) for n = 1..210</a> %e A300213 Some solutions for n=5 %e A300213 ..0..0..0..1..0..0. .0..1..1..1..0..1. .0..1..1..0..0..1. .0..0..1..1..0..1 %e A300213 ..0..0..1..1..0..1. .0..0..1..1..1..0. .0..0..1..0..0..0. .0..0..0..1..1..0 %e A300213 ..0..0..0..1..0..0. .0..0..0..1..0..1. .0..0..0..1..1..1. .0..0..0..0..0..0 %e A300213 ..0..0..0..1..0..0. .0..0..0..0..1..1. .0..0..0..1..0..1. .0..0..0..0..1..1 %e A300213 ..0..0..1..1..0..0. .0..1..0..1..0..1. .0..1..0..1..0..0. .0..1..0..0..0..1 %Y A300213 Cf. A300215. %K A300213 nonn %O A300213 1,1 %A A300213 _R. H. Hardin_, Feb 28 2018