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A018519
as a simple table
n
a(n)
1
1
2
2
3
4
4
5
5
7
6
8
7
10
8
14
9
16
10
20
11
28
12
35
13
40
14
56
15
70
16
80
17
112
18
140
19
280
20
560
[1,2,4,5,7,8,10,14,16,20,28,35,40,56,70,80,112, 140,280,560]