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A018350
as a simple table
n
a(n)
1
1
2
2
3
3
4
4
5
5
6
6
7
8
8
10
9
12
10
15
11
16
12
20
13
24
14
30
15
40
16
48
17
60
18
80
19
120
20
240
[1,2,3,4,5,6,8,10,12,15,16,20,24,30,40,48,60,80, 120,240]