A240615 - cp's OEIS frontend

A240615 Number of n-length words w over a 9-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	61397
11	315507
12	1708420
13	9693168
14	57360909
15	352099643
16	2229930365
17	14494768448
18	96229497555
19	649761232948
20	4446218110646
21	30745322129155
22	214353097904732
23	1504152530715607
24	10609439744527674
25	75146372454242527

[1, 1, 2, 5, 14, 46, 165, 651, 2771, 12638, 61397, 315507, 1708420, 9693168, 57360909, 352099643, 2229930365, 14494768448, 96229497555, 649761232948, 4446218110646, 30745322129155, 214353097904732, 1504152530715607, 10609439744527674, 75146372454242527]

cp's OEIS Frontend

A240615 Number of n-length words w over a 9-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