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A057398 as a simple table

na(n)
01
10
20
30
4-3
50
6-18
7-12
8-87
9-120
10-432
11-840
12-2883
13-5208
14-21378
15-39876
16-144507
17-309456
18-978888
19-2349828
20-6995931
21-17727576
22-52099902
23-133195908
24-389599548
25-1010029956
26-2921670744
27-7740553548

[1,0,0,0,-3,0,-18,-12,-87,-120,-432,-840,-2883,
 -5208,-21378,-39876,-144507,-309456,-978888,
 -2349828,-6995931,-17727576,-52099902,-133195908,
 -389599548,-1010029956,-2921670744,-7740553548]