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 A298886 #4 Jan 28 2018 08:46:24 %S A298886 5,49,34,141,243,516,814,1646,3312,6565,13040,25941,51679,103895, %T A298886 205265,411011,821599,1643914,3279755,6573928,13136700,26293574, %U A298886 52604464,105288984,210671989,421821199,844171966,1689881070,3382803573 %N A298886 Number of nX6 0..1 arrays with every element equal to 1, 2, 4, 6 or 8 king-move adjacent elements, with upper left element zero. %C A298886 Column 6 of A298888. %H A298886 R. H. Hardin, <a href="/A298886/b298886.txt">Table of n, a(n) for n = 1..210</a> %e A298886 Some solutions for n=7 %e A298886 ..0..1..0..0..1..1. .0..1..1..1..0..1. .0..1..1..0..0..0. .0..0..0..1..1..0 %e A298886 ..1..0..0..0..0..0. .1..0..0..0..0..1. .0..0..0..1..1..1. .1..0..0..0..0..1 %e A298886 ..0..0..0..1..0..1. .0..1..0..0..0..1. .1..1..0..0..0..0. .0..1..0..0..0..1 %e A298886 ..1..1..1..1..0..1. .0..1..0..0..0..0. .0..0..0..0..0..1. .0..1..0..0..0..0 %e A298886 ..0..1..1..1..0..1. .0..1..0..1..1..1. .1..1..0..0..0..1. .0..1..0..1..1..1 %e A298886 ..0..1..1..1..1..0. .1..1..1..1..1..0. .0..0..0..1..1..0. .1..1..1..1..1..0 %e A298886 ..1..0..0..1..1..1. .0..0..1..1..0..1. .1..1..0..1..0..1. .0..0..1..1..0..1 %Y A298886 Cf. A298888. %K A298886 nonn %O A298886 1,1 %A A298886 _R. H. Hardin_, Jan 28 2018