A294603 - cp's OEIS frontend

A294603 Number of words of semilength n over n-ary alphabet, either empty or beginning with the first letter of the alphabet, such that the index set of occurring letters is an integer interval [1, k], that can be built by repeatedly inserting doublets into the initially empty word.

n	a(n)
0	1
1	1
2	3
3	20
4	231
5	3864
6	85360
7	2353546
8	77963599
9	3019479344
10	133966276692
11	6702399275538
12	373406941221160
13	22930441709648290
14	1539004344848618466
15	112089683771614695478
16	8805334896381292460191
17	742162775145283382779168
18	66809386370870410069346476

[1, 1, 3, 20, 231, 3864, 85360, 2353546, 77963599, 3019479344, 133966276692, 6702399275538, 373406941221160, 22930441709648290, 1539004344848618466, 112089683771614695478, 8805334896381292460191, 742162775145283382779168, 66809386370870410069346476]

cp's OEIS Frontend

A294603 Number of words of semilength n over n-ary alphabet, either empty or beginning with the first letter of the alphabet, such that the index set of occurring letters is an integer interval [1, k], that can be built by repeatedly inserting doublets into the initially empty word.

Table of values

List of values