A064815 - OEIS

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A064815 as a simple table

n	a(n)
1	1
2	1
3	6
4	60
5	900
6	17880
7	441960
8	13064400
9	449386800
10	17630743200
11	776922300000
12	37990482532800
13	2041238825908800
14	119537563260528000
15	7577709770318352000
16	516967507671286560000
17	37765578642439804128000

[1,1,6,60,900,17880,441960,13064400,449386800, 17630743200,776922300000,37990482532800, 2041238825908800,119537563260528000, 7577709770318352000,516967507671286560000, 37765578642439804128000]