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A197950
as a simple table
n
a(n)
1
1
2
2
3
5
4
12
5
380
6
5266
7
190306
8
27564773
9
5837876758
10
2655396520136
[1,2,5,12,380,5266,190306,27564773,5837876758, 2655396520136]