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 A201069 #7 Sep 25 2021 10:23:32 %S A201069 21,749,3937,43308,2250982,11512566,3558888,473983329,4102010820, %T A201069 3773723044,16952125989,322374164226,702125798925,118364239437, %U A201069 7609460886830,38642046123073,22788500587323,61246570410530 %N A201069 Number of n X 5 0..6 arrays with every row and column nondecreasing rightwards and downwards, and the number of instances of each value within one of each other. %C A201069 Column 5 of A201072. %H A201069 R. H. Hardin, <a href="/A201069/b201069.txt">Table of n, a(n) for n = 1..21</a> %e A201069 Some solutions for n=4 %e A201069 ..0..0..1..2..2....0..0..1..2..5....0..1..2..2..4....0..0..0..1..2 %e A201069 ..0..1..2..3..3....0..1..3..3..5....0..1..3..4..6....1..2..3..3..3 %e A201069 ..1..3..4..4..6....1..2..4..4..6....0..1..3..4..6....1..4..4..4..6 %e A201069 ..5..5..5..6..6....2..3..4..6..6....3..5..5..5..6....2..5..5..6..6 %K A201069 nonn %O A201069 1,1 %A A201069 _R. H. Hardin_ Nov 26 2011