A347721 - OEIS

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A347721 as a simple table

n	a(n)
1	4
2	17
3	1028
4	234335718
5	2721614799931646837751078
6	4260202904298363102478702693273093147309410822238017929510397615838855700

[4,17,1028,234335718,2721614799931646837751078, 42602029042983631024787026932730931473094108222380\ 17929510397615838855700]