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A137481 as a simple table

na(n)
11
28
33
424
548
69
7-192
8216
9216
1027
11-2976
12-2304
131296
14864
1581
16-57600
17-44640
18-17280
196480
203240
21243
22-1336320
23-1036800
24-401760
25-103680
2629160
2711664
28729
29-36126720
30-28062720
31-10886400
32-2812320
33-544320
34122472
3540824
362187
37-1114767360
38-867041280
39-336752640
40-87091200

[1,8,3,24,48,9,-192,216,216,27,-2976,-2304,1296,
 864,81,-57600,-44640,-17280,6480,3240,243,
 -1336320,-1036800,-401760,-103680,29160,11664,729,
 -36126720,-28062720,-10886400,-2812320,-544320,
 122472,40824,2187,-1114767360,-867041280,
 -336752640,-87091200]