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A324126
as a simple table
n
a(n)
2
2
3
6
4
28
5
200
6
20703429013870789486355067368368128119278986281765151080710695359984173056
[2,6,28,200, 20703429013870789486355067368368128119278986281765\ 151080710695359984173056]