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 A281719 #4 Jan 28 2017 13:49:15 %S A281719 16,9,17,245,937,6417,37781,214045,1321909,7709401,45858679,274481652, %T A281719 1621718293,9681714758,57586120717,342417879408,2040527424639, %U A281719 12140992057625,72295270999213,430542760825365,2563358199717255 %N A281719 Number of 5Xn 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 A281719 Row 5 of A281715. %H A281719 R. H. Hardin, <a href="/A281719/b281719.txt">Table of n, a(n) for n = 1..210</a> %e A281719 Some solutions for n=4 %e A281719 ..0..0..0..0. .0..0..0..1. .0..1..0..1. .0..0..1..1. .0..0..1..1 %e A281719 ..0..0..0..0. .0..0..1..0. .1..0..1..0. .0..0..1..1. .0..1..1..1 %e A281719 ..0..0..0..0. .0..1..0..1. .1..1..0..0. .1..1..0..0. .0..0..1..1 %e A281719 ..0..0..1..1. .1..0..1..0. .1..1..0..0. .1..1..0..0. .0..0..1..1 %e A281719 ..0..1..1..1. .0..1..0..1. .1..0..0..0. .1..1..1..0. .0..0..0..1 %Y A281719 Cf. A281715. %K A281719 nonn %O A281719 1,1 %A A281719 _R. H. Hardin_, Jan 28 2017