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A163797
as a simple table
n
a(n)
1
3
2
5
3
7
4
39
5
93
6
267
7
557
8
2389
9
2467
10
4059
11
4681
12
6213
13
70507
14
151013
15
282477
16
421135
[3,5,7,39,93,267,557,2389,2467,4059,4681,6213, 70507,151013,282477,421135]