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 A321841 #3 Nov 19 2018 18:03:43 %S A321841 120,360,1470,4872,17649,60465,218360,779649,2878543,10662640, %T A321841 40402105,154308568,599106195,2346709225,9308176915,37232621263, %U A321841 150428771629,612404221280,2513790671891,10388482748377,43231607141305,180987402799559,762252080995334 %N A321841 Number of words w of length n such that each letter of the quinary alphabet is used at least once and for every prefix z of w we have #(z,a_i) = 0 or #(z,a_i) >= #(z,a_j) for all j>i and #(z,a_i) counts the occurrences of the i-th letter in z. %Y A321841 Column k=5 of A257783. %K A321841 nonn %O A321841 5,1 %A A321841 _Alois P. Heinz_, Nov 19 2018