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A228930 as a simple table

na(n)
11
2-4
38
467
5266
69757
747748
8-97258
9-251115
10671488
11-4724169
12-28356343
13125269419
14-498668029
15-5426804695
1615313259790
17-40462770156
18105160602326
19-4412226092528
20-350847041434052
21-54342998565206181

[1,-4,8,67,266,9757,47748,-97258,-251115,671488,
 -4724169,-28356343,125269419,-498668029,
 -5426804695,15313259790,-40462770156,105160602326,
 -4412226092528,-350847041434052,
 -54342998565206181]