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A152166 as a simple table

na(n)
01
1-2
22
3-4
44
5-8
68
7-16
816
9-32
1032
11-64
1264
13-128
14128
15-256
16256
17-512
18512
19-1024
201024
21-2048
222048
23-4096
244096
25-8192
268192
27-16384
2816384
29-32768
3032768
31-65536
3265536
33-131072
34131072
35-262144
36262144
37-524288
38524288
39-1048576
401048576

[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,-1048576,1048576]