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A079455
as a simple table
n
a(n)
1
1
2
1
3
2
4
6
5
20
6
104
7
716
8
7624
9
122010
10
2946285
11
103833895
12
5187290899
[1,1,2,6,20,104,716,7624,122010,2946285,103833895, 5187290899]