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A168468 as a simple table

na(n)
01
10
21
3-3
48
5-40
6256
7-1568
811108
9-96720
10908836
11-9084108
12101147408
13-1233325600
1415998088016
15-221845635248
163301710539408
17-52192183735680
18871157943761296
19-15360373687021488
20285403775884452608

[1,0,1,-3,8,-40,256,-1568,11108,-96720,908836,
 -9084108,101147408,-1233325600,15998088016,
 -221845635248,3301710539408,-52192183735680,
 871157943761296,-15360373687021488,
 285403775884452608]