A082569 - OEIS

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A082569 as a simple table

n	a(n)
1	2
2	3
3	8
4	32
5	160
6	960
7	6720
8	53760
9	483840
10	4838400
11	53222400
12	638668800
13	8302694400
14	116237721600
15	1743565824000
16	27897053184000
17	474249904128000
18	8536498274304000
19	162193467211776000
20	3243869344235520000

[2,3,8,32,160,960,6720,53760,483840,4838400, 53222400,638668800,8302694400,116237721600, 1743565824000,27897053184000,474249904128000, 8536498274304000,162193467211776000, 3243869344235520000]