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A188418
as a simple table
n
a(n)
1
1
2
4
3
39
4
723
5
21965
6
968230
7
57967660
8
4505774905
9
439923593145
10
52601045792520
[1,4,39,723,21965,968230,57967660,4505774905, 439923593145,52601045792520]