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A321365
as a simple table
n
a(n)
1
1
2
5805311
3
392908759
4
399614833907
5
2674764845549
6
21997277871211
7
67146783889057
[1,5805311,392908759,399614833907,2674764845549, 21997277871211,67146783889057]