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A078136
as a simple table
n
a(n)
1
4
2
8
3
9
4
12
5
13
6
17
7
18
8
21
9
22
10
26
11
27
12
30
13
31
14
35
15
39
[4,8,9,12,13,17,18,21,22,26,27,30,31,35,39]
