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A059373 as a simple table

na(n)
21
3-4
48
5-16
612
7-96
8-480
9-4672
10-45520
11-493120
12-5798912
13-73668608
14-1005335552
15-14671085568
16-228051746304
17-3762955404288
18-65707303602432
19-1210821292674048
20-23487031074109440
21-478463919131627520
22-10214440549929047040
23-228069193578011566080

[1,-4,8,-16,12,-96,-480,-4672,-45520,-493120,
 -5798912,-73668608,-1005335552,-14671085568,
 -228051746304,-3762955404288,-65707303602432,
 -1210821292674048,-23487031074109440,
 -478463919131627520,-10214440549929047040,
 -228069193578011566080]