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A128421
as a simple table
n
a(n)
1
2
2
3
3
4
4
5
5
6
6
8
7
20
8
56
9
101
10
108
11
141
12
202
13
265
14
364
15
401
16
1035
17
1588
18
3062
19
4191
20
4579
21
10373
[2,3,4,5,6,8,20,56,101,108,141,202,265,364,401, 1035,1588,3062,4191,4579,10373]