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A214350
as a simple table
n
a(n)
1
7
2
161
3
10507
4
1807653
5
790197579
6
861351043995
7
2318511875463567
8
15333331066778365463
[7,161,10507,1807653,790197579,861351043995, 2318511875463567,15333331066778365463]