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A078566
as a simple table
n
a(n)
1
1
2
1
3
2
4
6
5
20
6
105
7
726
8
7827
9
127611
10
3166349
11
115369643
12
5981665266
[1,1,2,6,20,105,726,7827,127611,3166349,115369643, 5981665266]