A321842 - cp's OEIS frontend

A321842 Number of words w of length n such that each letter of the senary 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)
6	720
7	2520
8	11760
9	43848
10	176490
11	665115
12	2630715
13	10224492
14	41126477
15	165441810
16	683213215
17	2840595291
18	12061223560
19	51668953199
20	225204435800
21	990537353423
22	4420156777761
23	19894290092220
24	90640449133488
25	416216322774452
26	1931286827029792
27	9024993532633957

[720, 2520, 11760, 43848, 176490, 665115, 2630715, 10224492, 41126477, 165441810, 683213215, 2840595291, 12061223560, 51668953199, 225204435800, 990537353423, 4420156777761, 19894290092220, 90640449133488, 416216322774452, 1931286827029792, 9024993532633957]

cp's OEIS Frontend

A321842 Number of words w of length n such that each letter of the senary 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