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A209112
as a simple table
n
a(n)
1
1
2
6
3
29
4
221
5
1683
6
14037
7
121117
8
1079992
9
9849223
10
91488850
11
862442967
12
8230097726
13
79348933361
[1,6,29,221,1683,14037,121117,1079992,9849223, 91488850,862442967,8230097726,79348933361]