login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A000758
as a simple table
n
a(n)
1
0
2
1
3
5
4
20
5
76
6
285
7
1066
8
3991
9
14976
10
56353
[0,1,5,20,76,285,1066,3991,14976,56353]