A321845 - cp's OEIS frontend

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.

n	a(n)
9	362880
10	1814400
11	11642400
12	57879360
13	302856840
14	1452611160
15	7181851950
16	34386725520
17	168206363745
18	815113118385
19	4018968988380
20	19841370665865
21	99477246363495
22	502000638243720
23	2569888903846460
24	13275926076237132
25	69519580918458790
26	367795800026341605

[362880, 1814400, 11642400, 57879360, 302856840, 1452611160, 7181851950, 34386725520, 168206363745, 815113118385, 4018968988380, 19841370665865, 99477246363495, 502000638243720, 2569888903846460, 13275926076237132, 69519580918458790, 367795800026341605]

cp's OEIS Frontend

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.

Table of values

List of values