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A018556
as a simple table
n
a(n)
1
1
2
2
3
3
4
4
5
6
6
8
7
12
8
13
9
16
10
24
11
26
12
39
13
48
14
52
15
78
16
104
17
156
18
208
19
312
20
624
[1,2,3,4,6,8,12,13,16,24,26,39,48,52,78,104,156, 208,312,624]