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A180213
as a simple table
n
a(n)
1
1
2
2
3
4
4
6
5
12
6
36
7
102
8
324
9
972
10
3190
11
12610
12
50254
13
214510
14
1000260
15
4848796
16
24798190
17
134817190
[1,2,4,6,12,36,102,324,972,3190,12610,50254, 214510,1000260,4848796,24798190,134817190]