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A013316 as a simple table

na(n)
11
22
30
4-12
5-60
632
73360
826768
9-70560
10-4368928
11-44014080
12286606848
1315535016640
14175871587712
15-2270496184320
16-116296341590272
17-1366735787784960
1831677729930493952
191572363556732784640

[1,2,0,-12,-60,32,3360,26768,-70560,-4368928,
 -44014080,286606848,15535016640,175871587712,
 -2270496184320,-116296341590272,-1366735787784960,
 31677729930493952,1572363556732784640]