login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A197650
as a simple table
n
a(n)
1
1
2
1
3
4
4
18
5
89
6
914
7
14965
8
321510
9
12712330
10
879485238
11
102013590235
12
20591125917598
13
6951014585410261
[1,1,4,18,89,914,14965,321510,12712330,879485238, 102013590235,20591125917598,6951014585410261]