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 A219469 #6 Jul 23 2025 00:29:56 %S A219469 56,1248,143718,14696377,1222433026,86755752059,5432184254977, %T A219469 310024709155795,16405518197790913,811074258908798713, %U A219469 37650885062774172715,1649171050584662652825,68487713712896868019851 %N A219469 Number of nX6 arrays of the minimum value of corresponding elements and their horizontal or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and columns, 0..3 nX6 array. %C A219469 Column 6 of A219471 %H A219469 R. H. Hardin, <a href="/A219469/b219469.txt">Table of n, a(n) for n = 1..15</a> %e A219469 Some solutions for n=3 %e A219469 ..0..0..1..2..2..1....0..0..0..2..2..2....0..0..0..2..2..2....0..0..0..1..1..0 %e A219469 ..1..2..0..0..1..1....0..2..2..2..1..1....0..0..1..2..1..1....0..0..1..0..0..0 %e A219469 ..0..0..0..0..1..1....3..3..3..3..0..0....0..0..2..3..1..3....1..3..1..0..1..3 %K A219469 nonn %O A219469 1,1 %A A219469 _R. H. Hardin_ Nov 20 2012