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A018498
as a simple table
n
a(n)
1
1
2
2
3
4
4
5
5
8
6
10
7
13
8
20
9
26
10
40
11
52
12
65
13
104
14
130
15
260
16
520
[1,2,4,5,8,10,13,20,26,40,52,65,104,130,260,520]