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A018371
as a simple table
n
a(n)
1
1
2
2
3
4
4
5
5
7
6
8
7
10
8
14
9
20
10
28
11
35
12
40
13
56
14
70
15
140
16
280
[1,2,4,5,7,8,10,14,20,28,35,40,56,70,140,280]