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A052573 as a simple table

na(n)
02
14
220
3168
41968
529280
6525600
711027520
8264579840
97142929920
10214280640000
117071181286400
12254561568307200
139927888709939200
14416971151460864000
1518763699200390144000
16900657519773147136000

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