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A238474 as a simple table

na(n)
03
1-6
220
3-90
4504
5-3360
625920
7-226800
82217600
9-23950080
10283046400
11-3632428800
1250295168000
13-747242496000
1411856247603200
15-200074178304000
163577797070848000
17-67580611338240000
181344498478202880000
19-28100018194440192000
20615524208068689920000

[3,-6,20,-90,504,-3360,25920,-226800,2217600,
 -23950080,283046400,-3632428800,50295168000,
 -747242496000,11856247603200,-200074178304000,
 3577797070848000,-67580611338240000,
 1344498478202880000,-28100018194440192000,
 615524208068689920000]