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 A281807 #4 Jan 30 2017 10:45:59 %S A281807 0,194,2272,32524,368408,4173476,45696162,473403162,4898077436, %T A281807 49143504252,486520814815,4761050383044,45945604199909, %U A281807 439730881714722,4170492590977309,39248795804453474,367025592669372327 %N A281807 Number of 6Xn 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 A281807 Row 6 of A281802. %H A281807 R. H. Hardin, <a href="/A281807/b281807.txt">Table of n, a(n) for n = 1..210</a> %e A281807 Some solutions for n=4 %e A281807 ..0..0..0..1. .0..0..1..1. .0..1..0..0. .0..1..1..0. .0..1..1..1 %e A281807 ..1..0..0..0. .0..1..1..1. .0..0..1..1. .1..0..0..0. .0..0..0..0 %e A281807 ..1..1..0..0. .1..0..0..0. .0..0..0..1. .1..1..0..0. .0..0..0..0 %e A281807 ..1..1..0..0. .0..0..0..0. .0..0..1..1. .1..1..1..1. .1..1..1..1 %e A281807 ..1..1..1..0. .1..1..1..1. .0..0..1..1. .1..0..1..1. .0..0..1..1 %e A281807 ..1..1..0..0. .0..1..1..1. .0..1..1..1. .1..1..1..1. .0..0..0..0 %Y A281807 Cf. A281802. %K A281807 nonn %O A281807 1,2 %A A281807 _R. H. Hardin_, Jan 30 2017