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A012836 as a simple table

na(n)
01
10
220
3-280
418000
5-1277760
6159922880
7-26119949440
85923118588160
9-1705199348152320
10619341836139299840
11-274598298613483878400
12146431095418622106193920
13-92305017354779154307399680

[1,0,20,-280,18000,-1277760,159922880,
 -26119949440,5923118588160,-1705199348152320,
 619341836139299840,-274598298613483878400,
 146431095418622106193920,
 -92305017354779154307399680]