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A121438 as a simple table

na(n)
01
1-1
21
3-3
4-3
51
6-17
7-3
8-6
91
10-160
11-25
125
13-10
141
15-2088
16-285
17-35
1830
19-15
201
21-34307
22-4179
23-420
24-91
2584
26-21
271
28-675091
29-74823
30-6916
31-497
32-322
33182
34-28
351
36-15428619
37-1577763
38-135639
39-10080
40-63
41-1002
42342
43-36
441
45-400928675
46-38209725
47-3082905
48-215700
49-14139
502655
51-2625

[1,-1,1,-3,-3,1,-17,-3,-6,1,-160,-25,5,-10,1,
 -2088,-285,-35,30,-15,1,-34307,-4179,-420,-91,84,
 -21,1,-675091,-74823,-6916,-497,-322,182,-28,1,
 -15428619,-1577763,-135639,-10080,-63,-1002,342,
 -36,1,-400928675,-38209725,-3082905,-215700,
 -14139,2655,-2625]