A052573 - OEIS

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A052573 as a simple table

n	a(n)
0	2
1	4
2	20
3	168
4	1968
5	29280
6	525600
7	11027520
8	264579840
9	7142929920
10	214280640000
11	7071181286400
12	254561568307200
13	9927888709939200
14	416971151460864000
15	18763699200390144000
16	900657519773147136000

[2,4,20,168,1968,29280,525600,11027520,264579840, 7142929920,214280640000,7071181286400, 254561568307200,9927888709939200, 416971151460864000,18763699200390144000, 900657519773147136000]