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A057378 as a simple table

na(n)
01
10
20
30
4-4
50
6-16
7-32
8-28
9-288
10-400
11-1024
12-5268
13-5920
14-32160
15-82720
16-163020
17-737568
18-1482784
19-4644992
20-15095436
21-33307648
22-117747376
23-312435552
24-842726356
25-2747491616
26-7020371952
27-21348043296

[1,0,0,0,-4,0,-16,-32,-28,-288,-400,-1024,-5268,
 -5920,-32160,-82720,-163020,-737568,-1482784,
 -4644992,-15095436,-33307648,-117747376,
 -312435552,-842726356,-2747491616,-7020371952,
 -21348043296]