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 A219684 #6 Jul 23 2025 00:36:10 %S A219684 21,32,452,5031,44736,344926,2706117,22404783,187497531,1518906665, %T A219684 11728070120,86620862097,616844079105,4256996307319,28523072830335, %U A219684 185674613829792,1175484129892778,7248518396992789,43607030016608124 %N A219684 Number of nX6 arrays of the minimum value of corresponding elements and their horizontal, vertical or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..2 nX6 array. %C A219684 Column 6 of A219686 %H A219684 R. H. Hardin, <a href="/A219684/b219684.txt">Table of n, a(n) for n = 1..34</a> %e A219684 Some solutions for n=3 %e A219684 ..2..2..2..1..0..0....1..1..0..0..0..0....2..0..0..0..0..0....1..1..1..1..0..0 %e A219684 ..2..2..2..1..0..0....1..1..0..0..0..0....2..0..0..0..0..0....1..1..1..1..0..0 %e A219684 ..2..2..2..1..1..2....1..1..1..0..0..0....2..2..2..2..1..1....2..2..1..0..0..0 %K A219684 nonn %O A219684 1,1 %A A219684 _R. H. Hardin_ Nov 25 2012