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A157490 as a simple table

na(n)
01
1-1
2-221
3671
4247741
5-1256641
6-679694561
74828434911
83472065862681
9-31713479172481
10-28496356975044101
11318124890738776351
12343010832773925500821
13-4525505109433347923521
14-5692750997030096043664841
1586662127452557373393360991
16124588000528729279236183338161

[1,-1,-221,671,247741,-1256641,-679694561,
 4828434911,3472065862681,-31713479172481,
 -28496356975044101,318124890738776351,
 343010832773925500821,-4525505109433347923521,
 -5692750997030096043664841,
 86662127452557373393360991,
 124588000528729279236183338161]