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A117575 as a simple table

na(n)
01
11
2-1
3-2
42
54
6-4
7-8
88
916
10-16
11-32
1232
1364
14-64
15-128
16128
17256
18-256
19-512
20512
211024
22-1024
23-2048
242048
254096
26-4096
27-8192
288192
2916384
30-16384
31-32768
3232768
3365536
34-65536
35-131072
36131072
37262144
38-262144
39-524288
40524288

[1,1,-1,-2,2,4,-4,-8,8,16,-16,-32,32,64,-64,-128,
 128,256,-256,-512,512,1024,-1024,-2048,2048,4096,
 -4096,-8192,8192,16384,-16384,-32768,32768,65536,
 -65536,-131072,131072,262144,-262144,-524288,
 524288]