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A018559
as a simple table
n
a(n)
1
1
2
2
3
3
4
5
5
6
6
7
7
9
8
10
9
14
10
15
11
18
12
21
13
30
14
35
15
42
16
45
17
63
18
70
19
90
20
105
21
126
22
210
23
315
24
630
[1,2,3,5,6,7,9,10,14,15,18,21,30,35,42,45,63,70, 90,105,126,210,315,630]