A291352 - OEIS

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A291352 as a simple table

n	a(n)
1	1
2	3
3	7
4	191
5	25983
6	2663063519
7	7160414743310596607
8	208229791652776621349215306687873023871
9	45218742589363955614633859184750699518167124046103786511727246869388335095775

[1,3,7,191,25983,2663063519,7160414743310596607, 208229791652776621349215306687873023871, 45218742589363955614633859184750699518167124046103\ 786511727246869388335095775]