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A266881
as a simple table
n
a(n)
1
9
2
351
3
33529
4
4555903
5
763867475
6
138332628493
7
25681615835531
8
4850980527140722
[9,351,33529,4555903,763867475,138332628493, 25681615835531,4850980527140722]