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A012443 as a simple table

na(n)
01
10
2-12
3120
4-1008
5-45120
6-11491392
71378925184
8-443544192768
953698137606144
10-32840379055537152
117093049054642411520
12-6636093887068155801600
132065820944848385959936000

[1,0,-12,120,-1008,-45120,-11491392,1378925184,
 -443544192768,53698137606144,-32840379055537152,
 7093049054642411520,-6636093887068155801600,
 2065820944848385959936000]