A321843 - cp's OEIS frontend

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.

n	a(n)
7	5040
8	20160
9	105840
10	438480
11	1941390
12	7981380
13	34199295
14	143278023
15	618279060
16	2662235895
17	11732993885
18	52051997928
19	235469637340
20	1076082576890
21	5001152965060
22	23506245393141
23	112121385673903
24	540819706031799
25	2642597365003695
26	13049933076792172

[5040, 20160, 105840, 438480, 1941390, 7981380, 34199295, 143278023, 618279060, 2662235895, 11732993885, 52051997928, 235469637340, 1076082576890, 5001152965060, 23506245393141, 112121385673903, 540819706031799, 2642597365003695, 13049933076792172]

cp's OEIS Frontend

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.

Table of values

List of values