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A219149
as a simple table
n
a(n)
1
1
2
4
3
32
4
531
5
20400
6
1707676
7
313358793
8
126050637852
9
111079912880127
10
214001518780274766
[1,4,32,531,20400,1707676,313358793,126050637852, 111079912880127,214001518780274766]