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A306047
as a simple table
n
a(n)
1
1
2
8
3
45
4
458
5
12349
6
554682
7
36596835
8
8395262149
9
4973359586800
10
4903224406630694
[1,8,45,458,12349,554682,36596835,8395262149, 4973359586800,4903224406630694]