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 A298928 #4 Jan 29 2018 08:16:22 %S A298928 0,13,7,72,255,955,3569,15031,61046,253624,1067751,4492809,18851449, %T A298928 79305038,333393642,1401954916,5897152044,24806594547,104353275618, %U A298928 439007735235,1846879331358,7769846838226,32688195410797,137521855214717 %N A298928 Number of nX6 0..1 arrays with every element equal to 2, 3, 5, 7 or 8 king-move adjacent elements, with upper left element zero. %C A298928 Column 6 of A298930. %H A298928 R. H. Hardin, <a href="/A298928/b298928.txt">Table of n, a(n) for n = 1..210</a> %e A298928 Some solutions for n=5 %e A298928 ..0..0..0..0..1..1. .0..0..0..1..1..1. .0..0..1..1..1..1. .0..0..0..0..0..0 %e A298928 ..0..0..0..0..1..1. .0..0..0..1..1..1. .0..1..0..0..0..1. .0..0..0..0..0..0 %e A298928 ..0..0..0..0..1..1. .0..0..0..1..1..1. .1..0..0..0..0..1. .0..0..0..0..0..0 %e A298928 ..0..0..0..0..1..1. .0..0..0..1..1..1. .1..0..0..0..0..1. .0..0..0..0..0..0 %e A298928 ..0..0..0..0..1..1. .0..0..0..1..1..1. .1..1..1..1..1..1. .0..0..0..0..0..0 %Y A298928 Cf. A298930. %K A298928 nonn %O A298928 1,2 %A A298928 _R. H. Hardin_, Jan 29 2018