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 A298258 #4 Jan 15 2018 14:59:24 %S A298258 0,34,14,201,604,3335,13991,70095,331341,1644480,8037526,39760955, %T A298258 194961246,961041475,4728481549,23295012230,114728093511,565337326343, %U A298258 2784889510658,13721663522023,67604705716170,333094024429888 %N A298258 Number of nX7 0..1 arrays with every element equal to 2, 3, 5 or 8 king-move adjacent elements, with upper left element zero. %C A298258 Column 7 of A298259. %H A298258 R. H. Hardin, <a href="/A298258/b298258.txt">Table of n, a(n) for n = 1..210</a> %e A298258 Some solutions for n=8 %e A298258 ..0..0..0..0..0..1..1. .0..0..0..0..0..1..1. .0..0..0..0..0..0..0 %e A298258 ..0..1..1..0..1..0..1. .0..1..1..1..1..0..1. .0..1..1..1..1..1..0 %e A298258 ..1..1..0..1..0..0..1. .1..0..0..0..1..0..1. .0..1..0..0..0..0..1 %e A298258 ..1..0..1..0..0..1..1. .0..1..1..0..1..0..1. .0..0..1..1..1..1..0 %e A298258 ..0..1..0..0..1..0..0. .0..1..0..1..1..0..1. .0..1..0..0..1..0..0 %e A298258 ..0..1..0..0..1..1..0. .0..0..1..0..1..0..1. .0..1..1..0..1..1..0 %e A298258 ..1..0..0..1..0..0..1. .1..0..0..1..0..0..1. .1..0..0..0..0..1..0 %e A298258 ..1..1..1..1..0..1..1. .1..1..1..1..1..1..1. .1..1..1..1..1..0..0 %Y A298258 Cf. A298259. %K A298258 nonn %O A298258 1,2 %A A298258 _R. H. Hardin_, Jan 15 2018