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A218642
as a simple table
n
a(n)
1
1
2
16001
3
2092027
4
268378101
5
34351677143
6
4396930705721
7
562806164441653
8
72039176523059285
[1,16001,2092027,268378101,34351677143, 4396930705721,562806164441653,72039176523059285]