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 A269001 #4 Feb 17 2016 07:32:51 %S A269001 128,3272,91491,2144780,49084071,1073436321,22995344760,483176766982, %T A269001 10012943674291,205190835537996,4165999185526245,83946395869892249, %U A269001 1680542804576091072,33458893826064355756,662949906600663076935 %N A269001 Number of 7Xn binary arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two not more than once. %C A269001 Row 7 of A268995. %H A269001 R. H. Hardin, <a href="/A269001/b269001.txt">Table of n, a(n) for n = 1..210</a> %H A269001 R. H. Hardin, <a href="/A269001/a269001.txt">Empirical recurrence of order 68</a> %F A269001 Empirical recurrence of order 68 (see link above) %e A269001 Some solutions for n=3 %e A269001 ..0..1..1. .1..0..0. .0..0..1. .1..1..0. .0..0..1. .1..1..0. .0..1..0 %e A269001 ..0..0..1. .0..1..0. .1..0..1. .0..0..1. .1..0..1. .0..0..0. .0..0..1 %e A269001 ..1..0..0. .0..1..1. .0..0..0. .0..0..0. .0..0..0. .1..0..0. .1..0..1 %e A269001 ..0..0..1. .0..0..0. .1..0..1. .1..0..1. .0..0..1. .0..1..0. .1..0..0 %e A269001 ..1..0..1. .0..0..1. .0..0..1. .1..0..0. .0..1..0. .0..0..0. .0..0..0 %e A269001 ..0..0..0. .0..0..1. .0..0..0. .1..0..1. .0..1..0. .0..1..0. .1..0..0 %e A269001 ..0..0..1. .1..0..0. .0..1..0. .1..0..0. .0..0..0. .0..0..1. .1..0..0 %Y A269001 Cf. A268995. %K A269001 nonn %O A269001 1,1 %A A269001 _R. H. Hardin_, Feb 17 2016