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 A279981 #4 Dec 24 2016 08:39:52 %S A279981 0,108,1650,15511,124030,887491,5870751,37029063,224989656,1329149598, %T A279981 7678897522,43562801122,243417797716,1342868232191,7327618165054, %U A279981 39607933952548,212329659406086,1129989079237450,5974847669219636 %N A279981 Number of 5Xn 0..1 arrays with no element equal to a strict majority of its horizontal and antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards. %C A279981 Row 5 of A279977. %H A279981 R. H. Hardin, <a href="/A279981/b279981.txt">Table of n, a(n) for n = 1..210</a> %e A279981 Some solutions for n=4 %e A279981 ..0..1..0..1. .0..1..0..1. .0..1..0..1. .0..0..0..1. .0..1..0..1 %e A279981 ..0..0..1..1. .0..1..0..1. .0..1..0..1. .0..1..0..0. .1..0..0..1 %e A279981 ..0..1..0..0. .1..0..0..1. .1..0..1..1. .0..0..1..1. .1..1..1..1 %e A279981 ..0..1..1..0. .1..0..1..1. .0..0..1..0. .1..1..0..1. .0..1..0..1 %e A279981 ..0..1..0..1. .0..1..0..0. .1..0..1..0. .0..1..0..1. .0..1..1..0 %Y A279981 Cf. A279977. %K A279981 nonn %O A279981 1,2 %A A279981 _R. H. Hardin_, Dec 24 2016