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A266653
as a simple table
n
a(n)
1
1
2
2
3
91
4
14540
5
5127134
6
3413004556
7
3833960867620
8
6716778465903760
9
17318905849792010100
[1,2,91,14540,5127134,3413004556,3833960867620, 6716778465903760,17318905849792010100]