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A081711
as a simple table
n
a(n)
1
2
2
3
3
4
4
5
5
8
6
17
7
23
8
26
9
35
10
47
11
82
12
100
13
147
14
183
15
271
16
492
17
708
18
1116
19
1538
20
2491
21
4207
22
4468
[2,3,4,5,8,17,23,26,35,47,82,100,147,183,271,492, 708,1116,1538,2491,4207,4468]