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A130757 as a simple table

na(n)
01
13
2-1
315
4-10
51
6105
7-105
821
9-1
10945
11-1260
12378
13-36
141
1510395
16-17325
176930
18-990
1955
20-1
21135135
22-270270
23135135
24-25740
252145
26-78
271
282027025
29-4729725
302837835
31-675675
3275075
33-4095
34105
35-1
3634459425
37-91891800
3864324260
39-18378360
402552550
41-185640
427140
43-136

[1,3,-1,15,-10,1,105,-105,21,-1,945,-1260,378,-36,
 1,10395,-17325,6930,-990,55,-1,135135,-270270,
 135135,-25740,2145,-78,1,2027025,-4729725,2837835,
 -675675,75075,-4095,105,-1,34459425,-91891800,
 64324260,-18378360,2552550,-185640,7140,-136]