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A018756
as a simple table
n
a(n)
1
1
2
2
3
4
4
5
5
7
6
10
7
14
8
20
9
28
10
35
11
49
12
70
13
98
14
140
15
196
16
245
17
490
18
980
[1,2,4,5,7,10,14,20,28,35,49,70,98,140,196,245, 490,980]