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A070240
as a simple table
n
a(n)
1
1
2
2
3
5
4
9
5
10
6
11
7
16
8
17
9
19
10
21
11
22
12
23
13
25
14
26
15
27
16
29
17
33
18
34
19
35
20
37
21
41
22
43
23
45
24
46
25
47
[1,2,5,9,10,11,16,17,19,21,22,23,25,26,27,29,33, 34,35,37,41,43,45,46,47]