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A302883
as a simple table
n
a(n)
1
1
2
2
3
37
4
238
5
20937
6
3452246
7
2899297652
8
7977498513759
9
75895729469717417
[1,2,37,238,20937,3452246,2899297652, 7977498513759,75895729469717417]