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A267728
as a simple table
n
a(n)
1
2
2
16
3
512
4
39330
5
9116396
6
4977655636
7
6910434801148
8
22619851307136958
9
176312563812861434000
[2,16,512,39330,9116396,4977655636,6910434801148, 22619851307136958,176312563812861434000]