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A326483 as a simple table

na(n)
01
1-2
2-4
340
480
5-1952
6-3904
7177280
8354560
9-25866752
10-51733504
115535262720
1211070525440
13-1633165156352
14-3266330312704
15635421069967360
161270842139934720
17-315212388819402752
18-630424777638805504
19194181169538675507200

[1,-2,-4,40,80,-1952,-3904,177280,354560,
 -25866752,-51733504,5535262720,11070525440,
 -1633165156352,-3266330312704,635421069967360,
 1270842139934720,-315212388819402752,
 -630424777638805504,194181169538675507200]