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A208975 as a simple table

na(n)
01
11
2-3
320
4-189
52232
6-31130
7497016
8-8907885
9176829104
10-3849436062
1191187523000
12-2335691914050
1364344487654800
14-1897619527612692
1559667237154623280
16-1993022006345620605
1770488571028815935072
18-2631925423768158446390

[1,1,-3,20,-189,2232,-31130,497016,-8907885,
 176829104,-3849436062,91187523000,-2335691914050,
 64344487654800,-1897619527612692,
 59667237154623280,-1993022006345620605,
 70488571028815935072,-2631925423768158446390]