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A012222 as a simple table

na(n)
01
11
21
3-3
4-15
541
6561
7-1243
8-40415
958001
104825121
11-1956083
12-866056815
13-740509639
14218527875281
15509169335477
16-73838559553215
17-295854887910879
1832207514779999041
19189240977761969437

[1,1,1,-3,-15,41,561,-1243,-40415,58001,4825121,
 -1956083,-866056815,-740509639,218527875281,
 509169335477,-73838559553215,-295854887910879,
 32207514779999041,189240977761969437]