A317681 - OEIS

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A317681 as a simple table

n	a(n)
2	1
3	2
4	6
5	24
6	120
7	4320
8	30240
9	8910720
10	14182439040
11	17116004505600
12	154345556085770649600
13	170974031122008628879954060917200710847692800
14	141310897947438348259849402738485523264343544818565120000

[1,2,6,24,120,4320,30240,8910720,14182439040, 17116004505600,154345556085770649600, 170974031122008628879954060917200710847692800, 14131089794743834825984940273848552326434354481856\ 5120000]