login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A051800
as a simple table
n
a(n)
1
1
2
2
3
3
4
4
5
5
6
11
7
18
8
23
9
26
10
30
11
80
12
120
13
148
14
220
15
395
16
776
17
884
18
977
19
3535
20
3927
[1,2,3,4,5,11,18,23,26,30,80,120,148,220,395,776, 884,977,3535,3927]