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A299887
as a simple table
n
a(n)
1
1
2
5
3
31
4
1308
5
135586
6
55414033
7
85265831295
8
430615712168102
9
7378237279248881087
[1,5,31,1308,135586,55414033,85265831295, 430615712168102,7378237279248881087]