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 A219588 #7 Jul 23 2025 00:33:24 %S A219588 3,7,84,1114,26006,1767430,415752625 %N A219588 Number of n X n arrays of the minimum value of corresponding elements and their horizontal or vertical neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..2 n X n array. %C A219588 Diagonal of A219595 %e A219588 Some solutions for n=3 %e A219588 ..0..0..0....1..0..0....1..0..0....0..0..0....1..0..0....0..0..0....1..0..0 %e A219588 ..1..0..0....1..1..0....2..1..0....2..0..0....1..0..0....0..0..0....2..0..0 %e A219588 ..0..0..0....2..1..1....2..2..1....2..2..2....2..0..0....2..2..0....2..0..0 %K A219588 nonn %O A219588 1,1 %A A219588 _R. H. Hardin_ Nov 23 2012