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 A281720 #4 Jan 28 2017 13:50:01 %S A281720 32,14,22,631,3166,29849,252867,1987696,17241122,141964135,1181349593, %T A281720 9947080570,82516604643,691237888796,5774613619314,48180216720264, %U A281720 403021368941890,3365534946520453,28122510061436727,235052865949118652 %N A281720 Number of 6Xn 0..1 arrays with no element unequal to a strict majority of its horizontal, diagonal and antidiagonal neighbors and with new values introduced in order 0 sequentially upwards. %C A281720 Row 6 of A281715. %H A281720 R. H. Hardin, <a href="/A281720/b281720.txt">Table of n, a(n) for n = 1..210</a> %e A281720 Some solutions for n=4 %e A281720 ..0..0..1..1. .0..0..1..1. .0..0..1..1. .0..1..1..1. .0..0..1..1 %e A281720 ..0..1..1..1. .1..1..0..0. .0..0..1..1. .0..0..1..1. .0..0..1..1 %e A281720 ..0..0..1..1. .1..1..0..0. .1..1..0..0. .0..0..1..1. .0..1..1..1 %e A281720 ..0..0..1..1. .1..1..0..0. .1..1..0..0. .0..0..1..1. .0..0..1..1 %e A281720 ..0..0..1..1. .1..0..0..0. .1..1..0..0. .0..0..1..1. .0..0..1..1 %e A281720 ..0..1..1..1. .0..1..1..1. .1..1..1..0. .0..0..1..1. .0..0..1..1 %Y A281720 Cf. A281715. %K A281720 nonn %O A281720 1,1 %A A281720 _R. H. Hardin_, Jan 28 2017