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A211036
as a simple table
n
a(n)
1
1
2
6
3
70
4
1584
5
69094
6
5804980
7
937523156
8
290938653352
9
173346851987198
[1,6,70,1584,69094,5804980,937523156,290938653352, 173346851987198]