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A089087 as a simple table

na(n)
01
11
2-1
32
4-4
51
66
7-18
812
9-1
1024
11-96
12108
13-32
141
15120
16-600
17960
18-540
1980
20-1
21720
22-4320
239000
24-7680
252430
26-192
271
285040
29-35280
3090720
31-105000
3253760
33-10206
34448
35-1
3640320
37-322560
38987840
39-1451520
401050000
41-344064
4240824
43-1024
441
45362880
46-3265920
4711612160
48-20744640
4919595520

[1,1,-1,2,-4,1,6,-18,12,-1,24,-96,108,-32,1,120,
 -600,960,-540,80,-1,720,-4320,9000,-7680,2430,
 -192,1,5040,-35280,90720,-105000,53760,-10206,448,
 -1,40320,-322560,987840,-1451520,1050000,-344064,
 40824,-1024,1,362880,-3265920,11612160,-20744640,
 19595520]