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A103995 as a simple table

na(n)
11
2-1
30
41
5-1
6-6
735
8181
9-6056
10-3741
115880885
12-149991434
13-32148902071
144867910308359
15891980177502800
16-740991835820243639
17-53134975005564905081
18626000780698404972023994

[1,-1,0,1,-1,-6,35,181,-6056,-3741,5880885,
 -149991434,-32148902071,4867910308359,
 891980177502800,-740991835820243639,
 -53134975005564905081,626000780698404972023994]