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A018399
as a simple table
n
a(n)
1
1
2
2
3
3
4
4
5
6
6
7
7
8
8
12
9
14
10
16
11
21
12
24
13
28
14
42
15
48
16
56
17
84
18
112
19
168
20
336
[1,2,3,4,6,7,8,12,14,16,21,24,28,42,48,56,84,112, 168,336]