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A197919
as a simple table
n
a(n)
1
1
2
4
3
12
4
94
5
1604
6
47877
7
2261778
8
187733882
9
30981880951
10
9213362077719
[1,4,12,94,1604,47877,2261778,187733882, 30981880951,9213362077719]