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 A219593 #6 Jul 23 2025 00:33:44 %S A219593 21,81,1188,14793,156964,1767430,21435360,259297241,2992271478, %T A219593 32522357305,335372829196,3312669542090,31487964667940, %U A219593 288434629481468,2549339374347045,21786411636714179,180452978644995861 %N A219593 Number of nX6 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 nX6 array. %C A219593 Column 6 of A219595 %H A219593 R. H. Hardin, <a href="/A219593/b219593.txt">Table of n, a(n) for n = 1..19</a> %e A219593 Some solutions for n=3 %e A219593 ..2..1..1..1..0..0....0..0..0..0..0..0....1..1..0..0..0..0....1..0..0..0..0..0 %e A219593 ..2..2..1..1..1..0....1..0..0..0..0..0....1..1..0..0..0..0....1..1..0..0..0..0 %e A219593 ..2..2..2..1..1..2....2..2..0..0..0..0....1..0..0..0..0..1....1..1..1..1..1..1 %K A219593 nonn %O A219593 1,1 %A A219593 _R. H. Hardin_ Nov 23 2012