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 A219881 #5 Jul 23 2025 00:45:44 %S A219881 21,32,600,6965,74998,764027,8017398,85092182,882578607,8731245391, %T A219881 82020525701,735991805511,6353407612599,53004720585300, %U A219881 428371858603213,3358742175425755 %N A219881 Number of nX6 arrays of the minimum value of corresponding elements and their horizontal, diagonal or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..2 nX6 array. %C A219881 Column 6 of A219883 %e A219881 Some solutions for n=3 %e A219881 ..0..0..0..0..0..0....1..0..0..0..0..0....0..0..0..0..0..0....2..2..0..0..0..0 %e A219881 ..0..0..0..0..0..0....1..0..0..0..0..0....0..0..0..0..0..0....2..2..0..0..0..0 %e A219881 ..0..1..0..1..0..1....1..2..1..0..0..0....1..1..2..2..0..2....2..2..1..1..1..1 %K A219881 nonn %O A219881 1,1 %A A219881 _R. H. Hardin_ Nov 30 2012