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A012581 as a simple table

na(n)
01
10
20
30
412
5-60
6210
7-1260
814448
9-139104
101131720
11-11676720
12163234632
13-2192512608
1427259115520
15-393931268640
166898028418048
17-119527801113984
181985315996055744
19-36767841202329984

[1,0,0,0,12,-60,210,-1260,14448,-139104,1131720,
 -11676720,163234632,-2192512608,27259115520,
 -393931268640,6898028418048,-119527801113984,
 1985315996055744,-36767841202329984]