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A070171
as a simple table
n
a(n)
1
2
2
18
3
84
4
15210
5
15216
6
66720
7
2858880
8
62905344
9
358313760
10
3633603510
[2,18,84,15210,15216,66720,2858880,62905344, 358313760,3633603510]