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A198055
as a simple table
n
a(n)
1
1
2
7
3
24
4
201
5
2473
6
49462
7
1645915
8
91920138
9
8607887484
10
1360576772241
[1,7,24,201,2473,49462,1645915,91920138, 8607887484,1360576772241]