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 A220756 #7 Jul 23 2025 01:26:32 %S A220756 4,28,4328,548130,1383229596,3442732323766,136599937752568134 %N A220756 Number of n X n arrays of the minimum value of corresponding elements and their horizontal, diagonal or antidiagonal neighbors in a random 0..3 n X n array. %C A220756 Diagonal of A220761 %e A220756 Some solutions for n=3 %e A220756 ..2..1..2....0..0..3....2..1..1....3..0..1....1..0..1....2..1..3....2..1..3 %e A220756 ..3..0..1....1..0..0....2..0..1....1..0..0....0..0..3....1..1..2....1..1..1 %e A220756 ..0..0..3....1..0..1....2..0..0....0..0..0....2..0..2....3..1..1....1..1..1 %K A220756 nonn %O A220756 1,1 %A A220756 _R. H. Hardin_ Dec 19 2012