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A333932
as a simple table
n
a(n)
1
5
2
15
3
35
4
140
5
1820
6
11375
7
820820
8
19019000
9
10790015600
10
1568726956160
11
7278234628665
12
7271181889157550
[5,15,35,140,1820,11375,820820,19019000, 10790015600,1568726956160,7278234628665, 7271181889157550]