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A207155
as a simple table
n
a(n)
1
1
2
2
3
11
4
106
5
1899
6
64973
7
4349876
8
549052024
9
133443751524
10
62140758790253
[1,2,11,106,1899,64973,4349876,549052024, 133443751524,62140758790253]