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A057390 as a simple table

na(n)
01
10
20
3-3
4-9
5-36
6-123
7-450
8-1764
9-6690
10-26649
11-104112
12-421248
13-1688337
14-6888978
15-28063296
16-115459524
17-475617330
18-1970737233
19-8184006855
20-34118533647
21-142565353488
22-597406140090

[1,0,0,-3,-9,-36,-123,-450,-1764,-6690,-26649,
 -104112,-421248,-1688337,-6888978,-28063296,
 -115459524,-475617330,-1970737233,-8184006855,
 -34118533647,-142565353488,-597406140090]