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A012503 as a simple table

na(n)
01
1-6
2108
3-5880
4624848
5-110121440
629157594048
7-10831610048896
85375188617697536
9-3434391975840699904
102745651126153216330752
11-2684651090523817558325248
123151501790727433916335149056

[1,-6,108,-5880,624848,-110121440,29157594048,
 -10831610048896,5375188617697536,
 -3434391975840699904,2745651126153216330752,
 -2684651090523817558325248,
 3151501790727433916335149056]