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A079575
as a simple table
n
a(n)
1
1
2
1
3
2
4
6
5
20
6
93
7
480
8
2960
9
19475
10
140851
11
1116717
12
10329833
13
121557264
[1,1,2,6,20,93,480,2960,19475,140851,1116717, 10329833,121557264]