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 A268788 #4 Feb 13 2016 12:26:07 %S A268788 38,850,14984,228384,3295246,45515227,611932378,8057509992, %T A268788 104456486696,1337467436839,16954554895936,213155407369839, %U A268788 2661273257222436,33030289066656341,407868045265169610,5014148928763408926 %N A268788 Number of nX7 binary arrays with some element plus some horizontally, vertically or antidiagonally adjacent neighbor totalling two exactly once. %C A268788 Column 7 of A268789. %H A268788 R. H. Hardin, <a href="/A268788/b268788.txt">Table of n, a(n) for n = 1..210</a> %H A268788 R. H. Hardin, <a href="/A268788/a268788.txt">Empirical recurrence of order 68</a> %F A268788 Empirical recurrence of order 68 (see link above) %e A268788 Some solutions for n=3 %e A268788 ..0..0..0..0..0..1..0. .0..1..0..0..1..0..0. .1..1..0..0..0..1..0 %e A268788 ..1..0..0..0..0..0..1. .0..0..0..1..0..0..0. .0..0..0..0..0..0..0 %e A268788 ..0..0..0..1..0..0..1. .0..1..0..0..0..1..0. .1..0..0..0..0..1..0 %Y A268788 Cf. A268789. %K A268788 nonn %O A268788 1,1 %A A268788 _R. H. Hardin_, Feb 13 2016