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A294291 as a simple table

na(n)
01
1-1
21
3-7
473
5-421
62641
7-32131
8403537
9-4527433
1057723841
11-902025631
1215198774361
13-258241785517
144617616213393
15-92675891536411
162008139896617121
17-44077045165245841
181009237851013130497
19-25134834585692446903
20658430145120963410281

[1,-1,1,-7,73,-421,2641,-32131,403537,-4527433,
 57723841,-902025631,15198774361,-258241785517,
 4617616213393,-92675891536411,2008139896617121,
 -44077045165245841,1009237851013130497,
 -25134834585692446903,658430145120963410281]