A052692 - OEIS

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A052692 as a simple table

n	a(n)
0	1
1	1
2	2
3	6
4	24
5	240
6	2160
7	20160
8	201600
9	2540160
10	36288000
11	558835200
12	9101030400
13	161902540800
14	3138418483200
15	65383718400000
16	1443672502272000
17	33790305669120000
18	838710955450368000

[1,1,2,6,24,240,2160,20160,201600,2540160, 36288000,558835200,9101030400,161902540800, 3138418483200,65383718400000,1443672502272000, 33790305669120000,838710955450368000]