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A005530
as a simple table
n
a(n)
1
2
2
6
3
38
4
942
5
325262
6
25768825638
7
129127208425774833206
8
2722258935367507707190488025630791841374
[2,6,38,942,325262,25768825638, 129127208425774833206, 2722258935367507707190488025630791841374]