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A012015 as a simple table

na(n)
01
10
2-4
3-192
4-7600
5-507136
6-40159040
7-4621348864
8-627047126784
9-113424912867328
10-23612736247718912
11-6196586681702039552
12-1827473399583593672704
13-652336666072894806360064

[1,0,-4,-192,-7600,-507136,-40159040,-4621348864,
 -627047126784,-113424912867328,-23612736247718912,
 -6196586681702039552,-1827473399583593672704,
 -652336666072894806360064]