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A005459
as a simple table
n
a(n)
0
1
1
2
2
3
3
4
4
5
5
6
6
8
7
9
8
10
9
11
10
12
11
20
12
21
13
28
14
30
15
35
16
36
17
60
18
84
19
156
[1,2,3,4,5,6,8,9,10,11,12,20,21,28,30,35,36,60,84, 156]