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A086562
as a simple table
n
a(n)
1
1
2
2
3
6
4
9
5
12
6
28
7
30
8
1811
9
1976
10
8384
11
53760
12
243875
13
639336
14
41381633
15
102621357
[1,2,6,9,12,28,30,1811,1976,8384,53760,243875, 639336,41381633,102621357]