login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A171010
as a simple table
n
a(n)
1
0
2
0
3
1
4
7
5
46
6
240
7
1207
8
6004
9
28903
10
137996
[0,0,1,7,46,240,1207,6004,28903,137996]