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A208985
as a simple table
n
a(n)
1
1
2
2
3
5
4
33
5
351
6
5404
7
104001
8
2416967
9
65820325
10
2058166065
11
72731671225
[1,2,5,33,351,5404,104001,2416967,65820325, 2058166065,72731671225]