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A126985 as a simple table

na(n)
01
1-8
256
3-400
42840
5-20208
6143664
7-1021728
87265240
9-51665200
10367392656
11-2612584928
1218578329456
13-132112749920
14939467783520
15-6680662171200
1647506922377560
17-337827035002800
182402325467002320
19-17083203745473120
20121480558396908240
21-863861754435010080

[1,-8,56,-400,2840,-20208,143664,-1021728,7265240,
 -51665200,367392656,-2612584928,18578329456,
 -132112749920,939467783520,-6680662171200,
 47506922377560,-337827035002800,2402325467002320,
 -17083203745473120,121480558396908240,
 -863861754435010080]