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A264703
as a simple table
n
a(n)
1
2
2
15
3
296
4
9024
5
492480
6
30233088
7
3589152768
8
470304423936
9
94978179072000
[2,15,296,9024,492480,30233088,3589152768, 470304423936,94978179072000]