A293885 - cp's OEIS frontend

A293885 Number of sets of nonempty words with a total of n letters over quaternary alphabet containing the fourth letter such that within each prefix of a word every letter of the alphabet is at least as frequent as the subsequent alphabet letter.

n	a(n)
4	1
5	5
6	25
7	102
8	410
9	1545
10	5784
11	21015
12	76248
13	272377
14	974208
15	3455177
16	12287351
17	43502174
18	154554897
19	547955950
20	1950335934
21	6937352521
22	24777223885
23	88515560121
24	317513893877
25	1139848959317
26	4108296484542
27	14823490668322
28	53689879422115
29	194704264528116

[1, 5, 25, 102, 410, 1545, 5784, 21015, 76248, 272377, 974208, 3455177, 12287351, 43502174, 154554897, 547955950, 1950335934, 6937352521, 24777223885, 88515560121, 317513893877, 1139848959317, 4108296484542, 14823490668322, 53689879422115, 194704264528116]

cp's OEIS Frontend

A293885 Number of sets of nonempty words with a total of n letters over quaternary alphabet containing the fourth letter such that within each prefix of a word every letter of the alphabet is at least as frequent as the subsequent alphabet letter.

Table of values

List of values