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A204013 as a simple table

na(n)
11
2-1
31
4-6
51
60
7-10
815
9-1
10-4
11-8
1240
13-28
141
15-16
1624
1756
18-110
1945
20-1
21-48
22160
23-72
24-224
25245
26-66
271
28-128
29608
30-880
31120
32672
33-476
3491
35-1
36-320
371920
38-4160
393520
400
41-1680
42840
43-120
441
45-768
465504
47-15360
4820384

[1,-1,1,-6,1,0,-10,15,-1,-4,-8,40,-28,1,-16,24,56,
 -110,45,-1,-48,160,-72,-224,245,-66,1,-128,608,
 -880,120,672,-476,91,-1,-320,1920,-4160,3520,0,
 -1680,840,-120,1,-768,5504,-15360,20384]