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A012681 as a simple table

na(n)
01
10
2-12
3480
4-25200
51789440
6-165502656
718976409088
8-2521802100480
9337469315481600
10-20084172331338752
11-21802197506685280256
1222192552544232587431936
13-18125174754251391091998720

[1,0,-12,480,-25200,1789440,-165502656,
 18976409088,-2521802100480,337469315481600,
 -20084172331338752,-21802197506685280256,
 22192552544232587431936,
 -18125174754251391091998720]