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 A280177 #4 Dec 28 2016 07:01:30 %S A280177 3,103,1082,8759,63336,421214,2665301,16203600,95738359,553426602, %T A280177 3144390918,17616571929,97552223101,534893931388,2908144474219, %U A280177 15695105501976,84158923368105,448686881821760,2379904102120128 %N A280177 Number of nX5 0..1 arrays with no element unequal to a strict majority of its horizontal, vertical and antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards. %C A280177 Column 5 of A280180. %H A280177 R. H. Hardin, <a href="/A280177/b280177.txt">Table of n, a(n) for n = 1..210</a> %e A280177 Some solutions for n=4 %e A280177 ..0..0..1..1..1. .0..0..0..1..1. .0..0..0..1..0. .0..0..0..0..0 %e A280177 ..0..1..1..0..1. .1..1..0..1..1. .1..1..1..1..0. .0..1..1..1..0 %e A280177 ..0..1..0..0..1. .1..0..1..1..1. .1..1..1..0..0. .1..1..1..0..0 %e A280177 ..1..1..0..0..1. .0..0..1..1..1. .1..1..1..0..0. .0..1..0..0..0 %Y A280177 Cf. A280180. %K A280177 nonn %O A280177 1,1 %A A280177 _R. H. Hardin_, Dec 28 2016