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A069509
as a simple table
n
a(n)
1
8
2
33
3
232
4
929
5
18581
6
29933992
7
108309414903801
8
5352871641494664941461782535
[8,33,232,929,18581,29933992,108309414903801, 5352871641494664941461782535]