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 A281800 #4 Jan 30 2017 10:40:08 %S A281800 9,524,7293,71290,575062,4173476,28237876,181908580,1130079060, %T A281800 6826668428,40329856919,233963451718,1336918963187,7542580750766, %U A281800 42091126713821,232677185939116,1275632896739723,6942735865021594 %N A281800 Number of nX6 0..1 arrays with no element unequal to a strict majority of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards. %C A281800 Column 6 of A281802. %H A281800 R. H. Hardin, <a href="/A281800/b281800.txt">Table of n, a(n) for n = 1..147</a> %e A281800 Some solutions for n=4 %e A281800 ..0..0..0..1..0..0. .0..0..1..1..1..1. .0..1..0..0..0..0. .0..1..0..1..0..0 %e A281800 ..1..1..0..0..0..1. .1..1..0..0..1..1. .1..0..1..1..1..1. .1..0..1..0..0..0 %e A281800 ..1..1..1..0..1..1. .1..0..0..1..0..0. .0..1..1..1..1..1. .1..1..0..0..1..1 %e A281800 ..0..0..0..1..1..1. .0..1..1..0..1..1. .1..0..1..0..0..0. .1..1..0..1..1..1 %Y A281800 Cf. A281802. %K A281800 nonn %O A281800 1,1 %A A281800 _R. H. Hardin_, Jan 30 2017