login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A031995
as a simple table
n
a(n)
1
0
2
1
3
2
4
3
5
4
6
5
7
6
8
7
9
8
10
9
11
10
12
12
13
13
14
14
15
15
16
16
17
17
18
18
19
19
20
20
21
21
22
24
23
25
24
26
25
27
26
28
[0,1,2,3,4,5,6,7,8,9,10,12,13,14,15,16,17,18,19, 20,21,24,25,26,27,28]