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 A321843 #3 Nov 19 2018 18:04:12 %S A321843 5040,20160,105840,438480,1941390,7981380,34199295,143278023, %T A321843 618279060,2662235895,11732993885,52051997928,235469637340, %U A321843 1076082576890,5001152965060,23506245393141,112121385673903,540819706031799,2642597365003695,13049933076792172 %N A321843 Number of words w of length n such that each letter of the septenary 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 A321843 Column k=7 of A257783. %K A321843 nonn %O A321843 7,1 %A A321843 _Alois P. Heinz_, Nov 19 2018