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A305662
as a simple table
n
a(n)
1
14
2
28
3
619829
4
64119408562
5
89683259163592378754652
6
97322840981260080521305808534009505107316888799
[14,28,619829,64119408562,89683259163592378754652, 97322840981260080521305808534009505107316888799]