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A127412 as a simple table

na(n)
01
11
2-1
31
4-2
5-3
61
7-3
8-15
9-18
101
11-4
12-44
13-144
14-160
151
16-5
17-100
18-625
19-1750
20-1875
211
22-6
23-195
24-1980
25-10044
26-25920
27-27216
281
29-7
30-343
31-5145
32-40817
33-184877
34-453789
35-470596
361
37-8
38-560
39-11648
40-132608
41-917504
42-3866624
43-9175040
44-9437184
451
46-9
47-864
48-23814
49-367416
50-3582306

[1,1,-1,1,-2,-3,1,-3,-15,-18,1,-4,-44,-144,-160,1,
 -5,-100,-625,-1750,-1875,1,-6,-195,-1980,-10044,
 -25920,-27216,1,-7,-343,-5145,-40817,-184877,
 -453789,-470596,1,-8,-560,-11648,-132608,-917504,
 -3866624,-9175040,-9437184,1,-9,-864,-23814,
 -367416,-3582306]