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A028940 as a simple table

na(n)
10
21
3-1
42
51
66
7-5
821
9-20
10161
11116
121357
13-3741
1418526
158385
16480106
17-239785
1812551561
19-59997896
20683916417
211849037896
2251678803961
23-270896443865
244881674119706
25-16683000076735
26997454379905326

[0,1,-1,2,1,6,-5,21,-20,161,116,1357,-3741,18526,
 8385,480106,-239785,12551561,-59997896,683916417,
 1849037896,51678803961,-270896443865,
 4881674119706,-16683000076735,997454379905326]