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A179320 as a simple table

na(n)
00
12
2-2
36
4-28
5160
6-936
74536
8-20448
9627264
10-19699200
1143908480
1217788273920
13-211715112960
14-41219197125120
151301670191808000
16160057006683033600
17-10037518414724505600
18-1007362871616478003200

[0,2,-2,6,-28,160,-936,4536,-20448,627264,
 -19699200,43908480,17788273920,-211715112960,
 -41219197125120,1301670191808000,
 160057006683033600,-10037518414724505600,
 -1007362871616478003200]