login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A158448
as a simple table
n
a(n)
1
1
2
2
3
3
4
8
5
18
6
50
7
135
8
385
9
1065
10
3053
11
8701
12
25579
13
73693
14
217718
15
635220
16
1888802
[1,2,3,8,18,50,135,385,1065,3053,8701,25579,73693, 217718,635220,1888802]