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 A279491 #4 Dec 13 2016 12:20:00 %S A279491 3,68,1433,26157,425588,6559816,98128162,1427793365,20331614084, %T A279491 284582186755,3927098316740,53546568580206,722667680151302, %U A279491 9667043295761140,128315967227062823,1691593872181009527 %N A279491 Number of nX5 0..1 arrays with no element equal to a strict majority of its horizontal, vertical and antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards. %C A279491 Column 5 of A279494. %H A279491 R. H. Hardin, <a href="/A279491/b279491.txt">Table of n, a(n) for n = 1..210</a> %e A279491 Some solutions for n=4 %e A279491 ..0..0..1..1..0. .0..0..1..0..0. .0..0..1..1..0. .0..1..1..0..0 %e A279491 ..0..1..0..0..1. .1..1..1..0..1. .0..1..0..1..0. .0..1..1..1..1 %e A279491 ..0..0..0..1..0. .0..0..1..1..0. .1..0..0..1..0. .0..0..1..0..0 %e A279491 ..1..1..1..0..1. .1..0..1..0..0. .1..1..0..0..1. .1..0..1..1..1 %Y A279491 Cf. A279494. %K A279491 nonn %O A279491 1,1 %A A279491 _R. H. Hardin_, Dec 13 2016