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A317598
as a simple table
n
a(n)
1
1
2
8
3
100
4
3047
5
218043
6
40015089
7
18167894481
8
20471431125281
9
58293522938785296
[1,8,100,3047,218043,40015089,18167894481, 20471431125281,58293522938785296]