login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A006227
as a simple table
n
a(n)
0
1
1
2
2
17
3
230
4
4894
5
222097
[1,2,17,230,4894,222097]