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A057374 as a simple table

na(n)
01
10
20
30
4-3
50
6-12
7-12
8-36
9-108
10-210
11-480
12-1746
13-2340
14-10566
15-19500
16-53976
17-152604
18-329424
19-971304
20-2403291
21-5955576
22-16858584
23-40337376
24-110301321
25-287061696
26-730223208
27-1985703720
28-5070001716

[1,0,0,0,-3,0,-12,-12,-36,-108,-210,-480,-1746,
 -2340,-10566,-19500,-53976,-152604,-329424,
 -971304,-2403291,-5955576,-16858584,-40337376,
 -110301321,-287061696,-730223208,-1985703720,
 -5070001716]