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A012221 as a simple table

na(n)
01
1-1
217
3-769
466401
5-9313281
61927198833
7-551835917697
8208856369686977
9-100945109069282817
1060655475821737151953
11-44346899335054478649345
1238762487400695339770533665

[1,-1,17,-769,66401,-9313281,1927198833,
 -551835917697,208856369686977,-100945109069282817,
 60655475821737151953,-44346899335054478649345,
 38762487400695339770533665]