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 A280063 #6 Apr 21 2020 12:57:57 %S A280063 1,1,5,52,790,23564,1188839,110266512,18113056960,5286615353516, %T A280063 2755789744812452 %N A280063 Number of n X n 0..1 arrays with no element unequal to a strict majority of its horizontal, vertical and antidiagonal neighbors and with new values introduced in order 0 sequentially upwards. %C A280063 Diagonal of A280069. %e A280063 Some solutions for n=4 %e A280063 ..0..0..1..1. .0..0..0..1. .0..0..1..1. .0..0..0..1. .0..0..0..0 %e A280063 ..0..0..1..1. .0..0..1..1. .0..0..1..1. .0..0..1..1. .0..0..0..0 %e A280063 ..0..0..0..0. .0..0..1..1. .0..0..1..1. .1..1..0..0. .1..1..1..0 %e A280063 ..0..0..0..0. .0..0..0..0. .0..0..1..1. .1..0..0..0. .1..1..1..0 %Y A280063 Cf. A280069. %K A280063 nonn %O A280063 1,3 %A A280063 _R. H. Hardin_, Dec 25 2016