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A057680
as a simple table
n
a(n)
1
1
2
16470
3
44899
4
79873884
5
711939213
6
36541622473
7
45677255610
8
62644957128
9
656430109694
[1,16470,44899,79873884,711939213,36541622473, 45677255610,62644957128,656430109694]