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A177621
as a simple table
n
a(n)
1
1
2
20
3
1635
4
339708
5
143060850
6
106681715484
7
128573202886349
8
234439539245241093
[1,20,1635,339708,143060850,106681715484, 128573202886349,234439539245241093]