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A013209 as a simple table

na(n)
10
21
3-2
47
5-24
6173
7-1280
811779
9-120960
101474969
11-19695232
12296068991
13-4847011840
1487094091589
15-1687646744576
1635308668668155
17-789939274514432
1818872654969343537
19-478658276989173760

[0,1,-2,7,-24,173,-1280,11779,-120960,1474969,
 -19695232,296068991,-4847011840,87094091589,
 -1687646744576,35308668668155,-789939274514432,
 18872654969343537,-478658276989173760]