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A332922
as a simple table
n
a(n)
1
21
2
24
3
27
4
30
5
33
6
36
7
39
8
42
9
42
10
45
11
60
12
66
13
75
14
81
15
99
16
105
17
171
18
306
[21,24,27,30,33,36,39,42,42,45,60,66,75,81,99,105, 171,306]