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A213068 as a simple table

na(n)
00
1-1
25
3-31
4-85
54919
61248125
7-158970631
82094813635
92311829506319
10-210731879464555
11-109642894428121231
1237051431528058442555
134409666909576599299719
14-6492299377660512249146035
15648925901618982079024132169

[0,-1,5,-31,-85,4919,1248125,-158970631,
 2094813635,2311829506319,-210731879464555,
 -109642894428121231,37051431528058442555,
 4409666909576599299719,-6492299377660512249146035,
 648925901618982079024132169]