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 A219122 #7 May 19 2023 15:21:47 %S A219122 3,15,787,42231,20168447,12934559893,54444733905291 %N A219122 Number of n X n arrays of the minimum value of corresponding elements and their horizontal, diagonal or antidiagonal neighbors in a random 0..2 n X n array. %C A219122 Diagonal of A219128. %e A219122 Some solutions for n=3 %e A219122 ..2..0..1....2..0..1....1..1..2....1..1..2....0..0..2....1..0..0....0..0..1 %e A219122 ..0..0..0....0..0..1....1..0..2....2..1..2....1..0..0....2..0..1....1..0..1 %e A219122 ..0..0..1....0..0..1....2..0..0....1..1..1....0..0..2....0..0..0....2..2..2 %Y A219122 Cf. A219128. %K A219122 nonn %O A219122 1,1 %A A219122 _R. H. Hardin_, Nov 12 2012