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A246980
as a simple table
n
a(n)
0
0
1
3
2
6
3
5
4
12
5
11
6
15
7
18
8
20
9
23
10
26
11
29
12
32
13
35
14
33
15
39
16
43
17
46
[0,3,6,5,12,11,15,18,20,23,26,29,32,35,33,39,43, 46]