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 A268778 #4 Feb 13 2016 09:46:39 %S A268778 23,148,1031,6383,38483,224960,1288693,7271509,40511381,223527424, %T A268778 1223021243,6646278717,35903716877,192977652868,1032630435883, %U A268778 5504232072227,29238119105311,154834459041646,817685821067843 %N A268778 Number of nX5 binary arrays with some element plus some horizontally, vertically, diagonally or antidiagonally adjacent neighbor totalling two no more than once. %C A268778 Column 5 of A268781. %H A268778 R. H. Hardin, <a href="/A268778/b268778.txt">Table of n, a(n) for n = 1..210</a> %F A268778 Empirical: a(n) = 4*a(n-1) +28*a(n-2) -62*a(n-3) -314*a(n-4) +78*a(n-5) +867*a(n-6) +6*a(n-7) -859*a(n-8) +46*a(n-9) +215*a(n-10) -8*a(n-11) -16*a(n-12) %e A268778 Some solutions for n=4 %e A268778 ..1..1..0..1..0. .1..1..0..0..0. .1..1..0..0..1. .0..1..0..0..0 %e A268778 ..0..0..0..0..0. .0..0..0..0..1. .0..0..0..0..0. .0..0..0..1..1 %e A268778 ..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0 %e A268778 ..0..0..1..0..0. .1..0..1..0..0. .0..1..0..0..0. .0..0..0..0..1 %Y A268778 Cf. A268781. %K A268778 nonn %O A268778 1,1 %A A268778 _R. H. Hardin_, Feb 13 2016