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A321807 as a simple table

na(n)
11
2-1025
359050
4-1047553
59765626
6-60526250
7282475250
8-1072692225
93486843451
10-10009766650
1125937424602
12-61858004650
13137858491850
14-289537131250
15576660215300
16-1098436836353
172015993900450
18-3574014537275
196131066257802

[1,-1025,59050,-1047553,9765626,-60526250,
 282475250,-1072692225,3486843451,-10009766650,
 25937424602,-61858004650,137858491850,
 -289537131250,576660215300,-1098436836353,
 2015993900450,-3574014537275,6131066257802]