login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A018625
as a simple table
n
a(n)
1
1
2
2
3
4
4
11
5
17
6
22
7
34
8
44
9
68
10
187
11
374
12
748
[1,2,4,11,17,22,34,44,68,187,374,748]