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A062220
as a simple table
n
a(n)
1
3
2
9
3
15
4
17
5
21
6
57
7
4233
8
4335
9
13221
10
26447
11
29897
12
91997
[3,9,15,17,21,57,4233,4335,13221,26447,29897, 91997]