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A012615 as a simple table

na(n)
01
10
2-12
3-120
4-5040
5-35520
6-10080576
71291774848
8-129155669760
970025050601472
10-12621771155397632
117717419122045659136
12-2918362206037173678080
131928021073359516653240320
14-1209535003923466323711246336
15977832736949625091059703971840

[1,0,-12,-120,-5040,-35520,-10080576,1291774848,
 -129155669760,70025050601472,-12621771155397632,
 7717419122045659136,-2918362206037173678080,
 1928021073359516653240320,
 -1209535003923466323711246336,
 977832736949625091059703971840]