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A018594
as a simple table
n
a(n)
1
1
2
2
3
3
4
5
5
6
6
10
7
15
8
23
9
30
10
46
11
69
12
115
13
138
14
230
15
345
16
690
[1,2,3,5,6,10,15,23,30,46,69,115,138,230,345,690]