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A081028
as a simple table
n
a(n)
1
2
2
3
3
6
4
10
5
18
6
20
7
25
8
33
9
40
10
53
11
56
12
69
13
79
14
89
15
95
16
108
[2,3,6,10,18,20,25,33,40,53,56,69,79,89,95,108]