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A007683 as a simple table

na(n)
11
2-3
33
49
521
6-33
7-1173
8-13515
9-113739
10-532209
116284379
12264830061
135897799141
14104393462439
151459983940203
1610308316834293
17-308010522508395
18-19576840707893409
19-726806556195360069
20-22261372611370303875
21-591210850189999983099

[1,-3,3,9,21,-33,-1173,-13515,-113739,-532209,
 6284379,264830061,5897799141,104393462439,
 1459983940203,10308316834293,-308010522508395,
 -19576840707893409,-726806556195360069,
 -22261372611370303875,-591210850189999983099]