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 A280178 #4 Dec 28 2016 07:02:23 %S A280178 9,263,3931,43094,421214,3755997,31821879,258976696,2046791216, %T A280178 15814457993,120011332264,897444910233,6629487497213,48466584078054, %U A280178 351182574432103,2524953934109755,18030795547257916,127983331651736137 %N A280178 Number of nX6 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 A280178 Column 6 of A280180. %H A280178 R. H. Hardin, <a href="/A280178/b280178.txt">Table of n, a(n) for n = 1..210</a> %e A280178 Some solutions for n=4 %e A280178 ..0..0..0..1..0..0. .0..1..1..1..1..1. .0..0..1..1..1..1. .0..0..0..0..0..1 %e A280178 ..1..1..1..1..0..1. .0..1..1..1..0..0. .0..0..1..0..0..0. .0..0..1..1..1..1 %e A280178 ..1..1..1..0..1..1. .0..1..0..0..0..0. .0..0..1..1..0..0. .0..1..1..0..0..1 %e A280178 ..0..0..0..0..1..1. .0..0..0..0..0..0. .0..0..1..1..0..0. .1..1..1..0..0..1 %Y A280178 Cf. A280180. %K A280178 nonn %O A280178 1,1 %A A280178 _R. H. Hardin_, Dec 28 2016