login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A007874
as a simple table
n
a(n)
1
1
2
1
3
1
4
2
5
4
6
10
7
24
8
63
9
177
10
428
11
1230
12
2556
13
8202
14
18506
15
18162
16
119069
[1,1,1,2,4,10,24,63,177,428,1230,2556,8202,18506, 18162,119069]