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A012054 as a simple table

na(n)
01
1-1
29
3-225
43345
5-893025
6-36212775
7-20892252225
8-3614048241375
9-1664630362370625
10-584598534985164375
11-327627617091486830625
12-181787523574523506599375
13-131875411531849225343390625

[1,-1,9,-225,3345,-893025,-36212775,-20892252225,
 -3614048241375,-1664630362370625,
 -584598534985164375,-327627617091486830625,
 -181787523574523506599375,
 -131875411531849225343390625]