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A012422 as a simple table

na(n)
02
1-12
2310
3-17304
41700458
5-258909860
656652535966
7-16866155567408
86564236008307922
9-3237559423419911996
101974150395798812732422
11-1458519974560491245318344
121283942399735883713487058746

[2,-12,310,-17304,1700458,-258909860,56652535966,
 -16866155567408,6564236008307922,
 -3237559423419911996,1974150395798812732422,
 -1458519974560491245318344,
 1283942399735883713487058746]