A240617 - cp's OEIS frontend

A240617 Number of n-length words w over an n-ary alphabet such that w is empty or a prefix z concatenated with letter a_i and i=1 or 0 < #(z,a_{i-1}) >= #(z,a_i), where #(z,a_i) counts the occurrences of the i-th letter in z.

n	a(n)
0	1
1	1
2	2
3	5
4	14
5	46
6	165
7	651
8	2771
9	12638
10	61398
11	315563
12	1710027
13	9725543
14	57886132
15	359476571
16	2323518017
17	15597303757
18	108522502933
19	781283103284
20	5810573402452
21	44579551962460
22	352360829928066
23	2865876353091752
24	23958937424819348
25	205673285003637629

[1, 1, 2, 5, 14, 46, 165, 651, 2771, 12638, 61398, 315563, 1710027, 9725543, 57886132, 359476571, 2323518017, 15597303757, 108522502933, 781283103284, 5810573402452, 44579551962460, 352360829928066, 2865876353091752, 23958937424819348, 205673285003637629]

cp's OEIS Frontend

A240617 Number of n-length words w over an n-ary alphabet such that w is empty or a prefix z concatenated with letter a_i and i=1 or 0 < #(z,a_{i-1}) >= #(z,a_i), where #(z,a_i) counts the occurrences of the i-th letter in z.

Table of values

List of values