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A198048
as a simple table
n
a(n)
1
1
2
7
3
39
4
392
5
7251
6
221673
7
11897698
8
1109783691
9
179093402627
10
50403959307911
[1,7,39,392,7251,221673,11897698,1109783691, 179093402627,50403959307911]