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A234815
as a simple table
n
a(n)
1
168
2
2220
3
15224
4
129384
5
747192
6
5441232
7
29871848
8
201644928
9
1092396888
10
7078853280
[168,2220,15224,129384,747192,5441232,29871848, 201644928,1092396888,7078853280]