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A128659
as a simple table
n
a(n)
1
3
2
4
3
5
4
6
5
7
6
9
7
13
8
14
9
20
10
30
11
40
12
44
13
86
14
101
15
135
16
152
17
171
18
205
19
4404
[3,4,5,6,7,9,13,14,20,30,40,44,86,101,135,152,171, 205,4404]