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A317005
as a simple table
n
a(n)
1
1
2
8
3
96
4
2567
5
147281
6
19006132
7
5395769696
8
3348077796513
9
4557407875546295
[1,8,96,2567,147281,19006132,5395769696, 3348077796513,4557407875546295]