login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A018741
as a simple table
n
a(n)
1
1
2
2
3
3
4
6
5
9
6
18
7
53
8
106
9
159
10
318
11
477
12
954
[1,2,3,6,9,18,53,106,159,318,477,954]