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A078942
as a simple table
n
a(n)
1
1
2
4
3
6
4
8
5
10
6
12
7
14
8
15
9
17
10
18
11
19
12
21
13
22
14
23
15
24
16
26
17
28
18
29
[1,4,6,8,10,12,14,15,17,18,19,21,22,23,24,26,28, 29]