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A004062
as a simple table
n
a(n)
1
2
2
3
3
7
4
29
5
71
6
127
7
271
8
509
9
1049
10
6389
11
6883
12
10613
13
19889
14
79987
15
608099
16
1365019
17
3360347
[2,3,7,29,71,127,271,509,1049,6389,6883,10613, 19889,79987,608099,1365019,3360347]