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A012224 as a simple table

na(n)
01
1-6
2184
3-13584
41840768
5-397140224
6124961670144
7-54024939321344
830732245464219648
9-22258174840910315520
1020000813079319781048320
11-21837489688957057049821184
1228476242253811580631861166080

[1,-6,184,-13584,1840768,-397140224,124961670144,
 -54024939321344,30732245464219648,
 -22258174840910315520,20000813079319781048320,
 -21837489688957057049821184,
 28476242253811580631861166080]