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A156517
as a simple table
n
a(n)
2
2
3
6
4
198
5
20472
6
11458140
7
15139474872
8
64914837681442
9
1549731064209250952
[2,6,198,20472,11458140,15139474872, 64914837681442,1549731064209250952]