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 A298894 #4 Jan 28 2018 09:07:15 %S A298894 0,34,26,229,1858,12224,74725,547497,4012035,28805843,209118279, %T A298894 1537327380,11240705948,82185225848,602873376262,4421261929905, %U A298894 32410993796867,237712768537660,1743828733781802,12791372365817836 %N A298894 Number of nX7 0..1 arrays with every element equal to 2, 3, 5, 6 or 8 king-move adjacent elements, with upper left element zero. %C A298894 Column 7 of A298895. %H A298894 R. H. Hardin, <a href="/A298894/b298894.txt">Table of n, a(n) for n = 1..210</a> %e A298894 Some solutions for n=7 %e A298894 ..0..0..1..1..0..0..0. .0..0..0..1..1..1..1. .0..0..1..0..0..1..1 %e A298894 ..0..1..0..0..1..1..0. .0..0..0..1..1..1..1. .0..1..1..0..0..1..1 %e A298894 ..0..1..0..1..1..1..0. .1..1..1..1..1..1..1. .1..0..0..1..0..0..0 %e A298894 ..0..1..0..1..0..0..0. .1..1..1..1..0..0..0. .1..1..1..1..0..0..0 %e A298894 ..0..1..0..1..0..1..0. .1..1..1..1..0..0..0. .1..0..1..1..1..1..1 %e A298894 ..1..0..0..1..0..1..1. .1..1..1..1..0..0..0. .1..0..0..1..1..1..1 %e A298894 ..1..1..1..1..0..0..1. .1..1..1..1..0..0..0. .1..1..0..1..1..1..1 %Y A298894 Cf. A298895. %K A298894 nonn %O A298894 1,2 %A A298894 _R. H. Hardin_, Jan 28 2018