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A120283 as a simple table

na(n)
15
21
3-5
47
5-15
67601
7-91
83617
9-745739
103317609
11-5981591
125436374093
13-213827575
14213745149261
15-249859397004145
16238988952277727
17-28354566442037
1826315271553053477373
19-108409774812137683
203394075340453838586663

[5,1,-5,7,-15,7601,-91,3617,-745739,3317609,
 -5981591,5436374093,-213827575,213745149261,
 -249859397004145,238988952277727,-28354566442037,
 26315271553053477373,-108409774812137683,
 3394075340453838586663]