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A012299 as a simple table

na(n)
00
12
2-8
3-88
46592
5-9568
6-49063808
74426189952
81122968737792
9-441081682390528
10-23926396899780608
1174405808039377364992
12-16597462789247237931008
13-19016633437725878038847488

[0,2,-8,-88,6592,-9568,-49063808,4426189952,
 1122968737792,-441081682390528,-23926396899780608,
 74405808039377364992,-16597462789247237931008,
 -19016633437725878038847488]