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A018528
as a simple table
n
a(n)
1
1
2
2
3
3
4
4
5
6
6
8
7
9
8
12
9
16
10
18
11
24
12
32
13
36
14
48
15
64
16
72
17
96
18
144
19
192
20
288
21
576
[1,2,3,4,6,8,9,12,16,18,24,32,36,48,64,72,96,144, 192,288,576]