login

A259057 as a simple table

na(n)
1-1
220
3-560
420160
5-887040
646126080
7-2767564800
8188194406400
9-14302774886400
101201433090457600
11-110531844322099200
1211053184432209920000
13-1193743918678671360000
14138474294566725877760000
15-17170812526274008842240000

[-1,20,-560,20160,-887040,46126080,-2767564800,
 188194406400,-14302774886400,1201433090457600,
 -110531844322099200,11053184432209920000,
 -1193743918678671360000,138474294566725877760000,
 -17170812526274008842240000]