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A013108 as a simple table

na(n)
01
1-4
240
3-1030
451160
5-4176250
6507867100
7-86130937750
819429666282000
9-5626346310003250
102034312191276462500
11-898279284686285368750
12475692945053706430375000
13-297573010648301986578906250

[1,-4,40,-1030,51160,-4176250,507867100,
 -86130937750,19429666282000,-5626346310003250,
 2034312191276462500,-898279284686285368750,
 475692945053706430375000,
 -297573010648301986578906250]