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A290765
as a simple table
n
a(n)
1
1
2
4
3
58
4
16790
5
10976541
6
17934472404
7
115038147988542
8
3086974276257455630
[1,4,58,16790,10976541,17934472404, 115038147988542,3086974276257455630]