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 A220146 #7 Jul 23 2025 00:53:28 %S A220146 3,11,77,1174,34959,3057777,822242009,671848868714 %N A220146 Number of n X n arrays of the minimum value of corresponding elements and their horizontal or diagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..2 n X n array. %C A220146 Diagonal of A220153 %e A220146 Some solutions for n=3 %e A220146 ..0..0..1....1..0..0....0..0..0....0..0..0....0..0..1....0..0..0....2..1..1 %e A220146 ..0..0..0....1..0..0....1..0..0....0..0..0....0..0..0....1..1..0....2..1..1 %e A220146 ..2..2..0....2..1..1....1..0..0....2..2..0....1..1..0....2..1..2....2..2..2 %K A220146 nonn %O A220146 1,1 %A A220146 _R. H. Hardin_ Dec 06 2012