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A138024 as a simple table

na(n)
11
2-1
31
42
5-4
62
7-6
812
9-12
104
1124
12-48
1348
14-32
158
16-120
17240
18-240
19160
20-80
2116
22720
23-1440
241440
25-960
26480
27-192
2832
29-5040
3010080
31-10080
326720
33-3360
341344
35-448
3664
3740320
38-80640
3980640
40-53760
4126880
42-10752
433584
44-1024
45128
46-362880
47725760
48-725760
49483840
50-241920
5196768
52-32256
539216

[1,-1,1,2,-4,2,-6,12,-12,4,24,-48,48,-32,8,-120,
 240,-240,160,-80,16,720,-1440,1440,-960,480,-192,
 32,-5040,10080,-10080,6720,-3360,1344,-448,64,
 40320,-80640,80640,-53760,26880,-10752,3584,-1024,
 128,-362880,725760,-725760,483840,-241920,96768,
 -32256,9216]