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 A219464 #7 Jul 23 2025 00:29:31 %S A219464 4,23,673,87083,43792361,86755752059,664221777830589 %N A219464 Number of n X n arrays of the minimum value of corresponding elements and their horizontal or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and columns, 0..3 n X n array. %C A219464 Diagonal of A219471 %e A219464 Some solutions for n=3 %e A219464 ..0..0..2....0..0..0....0..0..2....0..0..2....0..0..0....1..1..2....2..2..2 %e A219464 ..1..1..1....0..0..1....2..2..3....1..1..2....0..0..0....2..3..3....2..1..1 %e A219464 ..2..1..2....3..1..1....3..0..0....2..0..0....0..0..0....3..3..3....3..0..0 %K A219464 nonn %O A219464 1,1 %A A219464 _R. H. Hardin_ Nov 20 2012