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A290129
as a simple table
n
a(n)
1
3
2
21
3
246
4
3765
5
64032
6
1130463
7
20215254
8
363069729
9
6530385420
10
117517503027
11
2115137375634
[3,21,246,3765,64032,1130463,20215254,363069729, 6530385420,117517503027,2115137375634]