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A086693
as a simple table
n
a(n)
1
2
2
9
3
445
4
65685
5
11262113374
6
9373678643933
7
17547676024364306476
8
36020106660104388871845
[2,9,445,65685,11262113374,9373678643933, 17547676024364306476,36020106660104388871845]