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A302959
as a simple table
n
a(n)
1
1
2
8
3
154
4
6206
5
493132
6
83644490
7
28906043997
8
20541759534725
9
30306087158412513
[1,8,154,6206,493132,83644490,28906043997, 20541759534725,30306087158412513]