A270397 - OEIS

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A270397 as a simple table

n	a(n)
1	2
2	3
3	6
4	21
5	411
6	120274
7	10572781147
8	74407087111123560666
9	5372512080606517833291366730287672914459
10	41169436260792910821230360026041473906108740980452651576082359437785122898819171

[2,3,6,21,411,120274,10572781147, 74407087111123560666, 5372512080606517833291366730287672914459, 41169436260792910821230360026041473906108740980452\ 651576082359437785122898819171]