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A214535
as a simple table
n
a(n)
1
4
2
8
3
38
4
344
5
5360
6
141470
7
6042900
8
420213820
9
47817344852
10
8897304579262
[4,8,38,344,5360,141470,6042900,420213820, 47817344852,8897304579262]