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A125739
as a simple table
n
a(n)
1
3
2
5
3
7
4
17
5
19
6
79
7
163
8
317
9
353
10
1049
11
1759
12
5153
13
7541
14
23743
15
2237561
16
4043119
[3,5,7,17,19,79,163,317,353,1049,1759,5153,7541, 23743,2237561,4043119]