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 A298086 #4 Jan 12 2018 09:01:56 %S A298086 0,34,18,213,1574,11202,65218,479206,3481050,24695892,177272585, %T A298086 1292781132,9346339114,67597407637,490930663188,3562917786488, %U A298086 25842902976432,187580825378770,1361838171557890,9885195460409937 %N A298086 Number of nX7 0..1 arrays with every element equal to 2, 3, 5 or 6 king-move adjacent elements, with upper left element zero. %C A298086 Column 7 of A298087. %H A298086 R. H. Hardin, <a href="/A298086/b298086.txt">Table of n, a(n) for n = 1..210</a> %e A298086 Some solutions for n=7 %e A298086 ..0..0..0..0..0..0..0. .0..0..0..0..0..0..1. .0..0..1..1..0..1..1 %e A298086 ..0..1..1..1..1..1..0. .0..1..1..1..0..1..1. .0..1..1..0..0..0..1 %e A298086 ..1..0..1..0..0..1..0. .1..0..1..0..0..1..0. .1..1..1..1..1..1..0 %e A298086 ..0..1..0..1..0..1..0. .1..0..0..0..0..0..0. .0..0..1..1..0..0..1 %e A298086 ..0..0..1..1..0..1..0. .0..1..1..0..0..1..0. .0..0..1..0..1..1..0 %e A298086 ..1..0..0..0..1..1..0. .0..0..1..1..0..1..1. .0..0..1..0..0..0..1 %e A298086 ..1..1..1..1..1..0..0. .0..1..1..0..0..0..1. .0..0..1..1..1..1..1 %Y A298086 Cf. A298087. %K A298086 nonn %O A298086 1,2 %A A298086 _R. H. Hardin_, Jan 12 2018