A034382 - OEIS

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A034382 as a simple table

n	a(n)
1	1
2	2
3	3
4	16
5	30
6	360
7	840
8	15360
9	68040
10	907200
11	3991680
12	159667200
13	518918400
14	14529715200
15	163459296000
16	4250979532800
17	22230464256000
18	1200445069824000
19	6758061133824000
20	405483668029440000

[1,2,3,16,30,360,840,15360,68040,907200,3991680, 159667200,518918400,14529715200,163459296000, 4250979532800,22230464256000,1200445069824000, 6758061133824000,405483668029440000]