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A075513 as a simple table

na(n)
11
2-1
32
41
5-8
69
7-1
824
9-81
1064
111
12-64
13486
14-1024
15625
16-1
17160
18-2430
1910240
20-15625
217776
221
23-384
2410935
25-81920
26234375
27-279936
28117649
29-1
30896
31-45927
32573440
33-2734375
345878656
35-5764801
362097152
371
38-2048
39183708
40-3670016
4127343750
42-94058496
43161414428
44-134217728
4543046721

[1,-1,2,1,-8,9,-1,24,-81,64,1,-64,486,-1024,625,
 -1,160,-2430,10240,-15625,7776,1,-384,10935,
 -81920,234375,-279936,117649,-1,896,-45927,573440,
 -2734375,5878656,-5764801,2097152,1,-2048,183708,
 -3670016,27343750,-94058496,161414428,-134217728,
 43046721]