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A065163
as a simple table
n
a(n)
1
1
2
1
3
3
4
7
5
25
6
216
7
963
8
23435
9
92225
10
2729205
11
17313348
12
182553725
13
4235194171
[1,1,3,7,25,216,963,23435,92225,2729205,17313348, 182553725,4235194171]