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A182626 as a simple table

na(n)
01
1-1
25
3-25
4129
5-681
63653
7-19825
8108545
9-598417
103317445
11-18474633
12103274625
13-579168825
143256957317
15-18359266785
16103706427393
17-586889743905
183326741166725
19-18885056428537
20107347191941249
21-610916200215241

[1,-1,5,-25,129,-681,3653,-19825,108545,-598417,
 3317445,-18474633,103274625,-579168825,3256957317,
 -18359266785,103706427393,-586889743905,
 3326741166725,-18885056428537,107347191941249,
 -610916200215241]