login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A018694
as a simple table
n
a(n)
1
1
2
2
3
4
4
8
5
109
6
218
7
436
8
872
[1,2,4,8,109,218,436,872]