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A171326
as a simple table
n
a(n)
1
21
2
440
3
9178
4
188356
5
3959768
6
83153605
7
1738979798
8
36412811648
9
761311432412
[21,440,9178,188356,3959768,83153605,1738979798, 36412811648,761311432412]