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A198007
as a simple table
n
a(n)
1
1
2
7
3
51
4
1165
5
80519
6
12594359
7
5423217685
8
5925057763939
9
16185578398527540
[1,7,51,1165,80519,12594359,5423217685, 5925057763939,16185578398527540]