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A330085
as a simple table
n
a(n)
0
2
1
4
2
7
3
9
4
12
5
14
6
16
7
19
8
21
9
23
10
26
11
28
12
30
13
32
14
34
15
37
16
39
17
41
18
43
19
45
[2,4,7,9,12,14,16,19,21,23,26,28,30,32,34,37,39, 41,43,45]