login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A260511
as a simple table
n
a(n)
1
1
2
3
3
15
4
120
5
1227
6
15188
[1,3,15,120,1227,15188]