A321845 Number of words w of length n such that each letter of the nonary 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.
362880, 1814400, 11642400, 57879360, 302856840, 1452611160, 7181851950, 34386725520, 168206363745, 815113118385, 4018968988380, 19841370665865, 99477246363495, 502000638243720, 2569888903846460, 13275926076237132, 69519580918458790, 367795800026341605
Offset: 9
Keywords
Crossrefs
Column k=9 of A257783.