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A305524
as a simple table
n
a(n)
1
1
2
8
3
161
4
7385
5
767417
6
180860170
7
98651246976
8
122959485595061
9
349219952815780064
[1,8,161,7385,767417,180860170,98651246976, 122959485595061,349219952815780064]