A213291 - cp's OEIS frontend

A213291 Number of n-length words w over ternary alphabet such that 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)
0	1
1	3
2	9
3	18
4	36
5	74
6	165
7	367
8	869
9	2074
10	5168
11	13026
12	33749
13	88368
14	235389
15	632324
16	1717202
17	4693604
18	12921864
19	35751336
20	99416633
21	277527448
22	777659128
23	2185854247
24	6162168724
25	17416305904
26	49342480077
27	140094014788
28	398558682310
29	1135962971848

[1, 3, 9, 18, 36, 74, 165, 367, 869, 2074, 5168, 13026, 33749, 88368, 235389, 632324, 1717202, 4693604, 12921864, 35751336, 99416633, 277527448, 777659128, 2185854247, 6162168724, 17416305904, 49342480077, 140094014788, 398558682310, 1135962971848]

cp's OEIS Frontend

A213291 Number of n-length words w over ternary alphabet such that 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