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A197791
as a simple table
n
a(n)
1
1
2
7
3
24
4
208
5
2623
6
56379
7
2049939
8
129937199
9
14288858831
10
2747104046529
[1,7,24,208,2623,56379,2049939,129937199, 14288858831,2747104046529]