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A055238
as a simple table
n
a(n)
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
11
12
12
14
13
15
14
16
15
18
16
20
17
24
18
28
19
30
20
36
21
42
22
48
23
60
24
120
[1,2,3,4,5,6,7,8,9,10,12,14,15,16,18,20,24,28,30, 36,42,48,60,120]