A321844 Number of words w of length n such that each letter of the octonary 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.
40320, 181440, 1058400, 4823280, 23296680, 103757940, 478790130, 2149170345, 9894491985, 45282147720, 211500002835, 991730832582, 4733756233145, 22787184211575, 111475945291060, 551049677448403, 2764601557859302, 14023910986706605, 72114359742608090
Offset: 8
Keywords
Crossrefs
Column k=8 of A257783.