A180418 - OEIS

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A180418 as a simple table

n	a(n)
2	1
3	3
4	39
5	32163
6	1720635
7	12345020175
8	1530993953307
9	44148864630732711
10	797213247855503373843915
11	281095572810489332134542303
12	26242778669866462496740532647355475

[1,3,39,32163,1720635,12345020175,1530993953307, 44148864630732711,797213247855503373843915, 281095572810489332134542303, 26242778669866462496740532647355475]