login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A003863
as a simple table
n
a(n)
1
1
2
7
3
14
4
20
5
21
6
21
7
21
8
28
9
35
10
45
11
45
12
56
13
64
14
70
[1,7,14,20,21,21,21,28,35,45,45,56,64,70]