login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A018317
as a simple table
n
a(n)
1
1
2
2
3
4
4
43
5
86
6
172
[1,2,4,43,86,172]
