login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A193674
as a simple table
n
a(n)
0
1
1
2
2
5
3
19
4
184
5
14664
6
108295846
7
2796163199765896
[1,2,5,19,184,14664,108295846,2796163199765896]