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A167524
as a simple table
n
a(n)
1
1
2
4
3
6
4
7
5
8
6
9
7
11
8
12
9
13
10
15
11
17
12
19
13
30
14
40
15
42
16
46
17
48
18
49
19
60
20
62
21
64
22
66
23
67
[1,4,6,7,8,9,11,12,13,15,17,19,30,40,42,46,48,49, 60,62,64,66,67]