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A207152
as a simple table
n
a(n)
1
1
2
7
3
39
4
433
5
8739
6
299157
7
18392685
8
2000831273
9
383836993467
10
130672069239103
[1,7,39,433,8739,299157,18392685,2000831273, 383836993467,130672069239103]