login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A147397
as a simple table
n
a(n)
1
1
2
1
3
1
4
5
5
17
6
45
7
217
8
1729
9
28581
10
422837
11
7769557
12
212491441
13
9353130173
14
579241228119
[1,1,1,5,17,45,217,1729,28581,422837,7769557, 212491441,9353130173,579241228119]