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A305402 as a simple table

na(n)
01
11
2-2
33
4-4
52
615
7-18
89
9-2
10105
11-120
1260
13-16
142
15945
16-1050
17525
18-150
1925
20-2
2110395
22-11340
235670
24-1680
25315
26-36
272
28135135
29-145530
3072765
31-22050
324410
33-588
3449
35-2
362027025
37-2162160
381081080
39-332640
4069300
41-10080
421008
43-64
442

[1,1,-2,3,-4,2,15,-18,9,-2,105,-120,60,-16,2,945,
 -1050,525,-150,25,-2,10395,-11340,5670,-1680,315,
 -36,2,135135,-145530,72765,-22050,4410,-588,49,-2,
 2027025,-2162160,1081080,-332640,69300,-10080,
 1008,-64,2]