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 A279970 #6 Apr 21 2020 12:56:55 %S A279970 0,3,50,1922,124030,14787217,3444870482,1641425782980, %T A279970 1628526202127628,3404399281023205196,15152580196285407820510 %N A279970 Number of n X n 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 A279970 Diagonal of A279977. %e A279970 Some solutions for n=4 %e A279970 ..0..1..1..0. .0..1..0..0. .0..1..0..0. .0..1..0..1. .0..1..0..0 %e A279970 ..1..0..0..1. .1..1..1..0. .0..1..1..0. .0..0..0..1. .0..1..1..0 %e A279970 ..1..0..1..0. .0..0..1..0. .1..0..1..0. .1..1..0..1. .0..0..0..1 %e A279970 ..0..1..0..1. .1..1..0..1. .0..0..1..1. .1..1..0..1. .1..1..1..0 %Y A279970 Cf. A279977. %K A279970 nonn %O A279970 1,2 %A A279970 _R. H. Hardin_, Dec 24 2016