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A028944 as a simple table

na(n)
00
1-1
21
3-5
4-20
5116
6-3741
78385
8-239785
9-59997896
101849037896
11-270896443865
12-16683000076735
132786836257692691
14-3148929681285740316
15342115756927607927420
16-280251129922563291422645
17-804287518035141565236193151

[0,-1,1,-5,-20,116,-3741,8385,-239785,-59997896,
 1849037896,-270896443865,-16683000076735,
 2786836257692691,-3148929681285740316,
 342115756927607927420,-280251129922563291422645,
 -804287518035141565236193151]