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A204313
as a simple table
n
a(n)
1
15015804
2
4174580535
3
1225171069740
4
322734860977140
5
87856146496713616
6
24056313371018644679
[15015804,4174580535,1225171069740, 322734860977140,87856146496713616, 24056313371018644679]