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A360919
as a simple table
n
a(n)
1
1
2
4
3
10
4
32
5
22
6
4120
7
488
8
65864
9
166
10
1296
11
872
12
37652512
13
678412
14
1858036816
15
337856
[1,4,10,32,22,4120,488,65864,166,1296,872, 37652512,678412,1858036816,337856]