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A226595
as a simple table
n
a(n)
1
0
2
2
3
4
4
7
5
9
6
12
7
15
8
17
9
20
10
24
11
27
12
29
13
33
14
36
15
39
[0,2,4,7,9,12,15,17,20,24,27,29,33,36,39]