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A135108
as a simple table
n
a(n)
1
2
2
3
3
4
4
6
5
8
6
12
7
20
8
72
9
196
10
676
11
1528
12
1923
13
5244
14
5379
15
6308
16
21222
17
81778
[2,3,4,6,8,12,20,72,196,676,1528,1923,5244,5379, 6308,21222,81778]