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A209070
as a simple table
n
a(n)
1
1
2
6
3
30
4
223
5
1722
6
14431
7
125428
8
1125484
9
10331019
10
96583955
11
916363757
12
8801147754
13
85402605777
[1,6,30,223,1722,14431,125428,1125484,10331019, 96583955,916363757,8801147754,85402605777]