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A015286 as a simple table

na(n)
31
4-2040
54508570
6-9900819720
721752862899691
8-47790911017216080
9104996653267533662740
10-230677643550873536294640
11506798783502833908602716981
12-1113436927250681654567602842120

[1,-2040,4508570,-9900819720,21752862899691,
 -47790911017216080,104996653267533662740,
 -230677643550873536294640,
 506798783502833908602716981,
 -1113436927250681654567602842120]