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A138380 as a simple table

na(n)
01
12
2-1
3-2
4-4
5-8
64
78
816
932
10-16
11-32
12-64
13-128
1464
15128
16256
17512
18-256
19-512
20-1024
21-2048
221024
232048
244096
258192
26-4096
27-8192
28-16384
29-32768
3016384
3132768
3265536
33131072
34-65536
35-131072
36-262144
37-524288
38262144
39524288
401048576
412097152

[1,2,-1,-2,-4,-8,4,8,16,32,-16,-32,-64,-128,64,
 128,256,512,-256,-512,-1024,-2048,1024,2048,4096,
 8192,-4096,-8192,-16384,-32768,16384,32768,65536,
 131072,-65536,-131072,-262144,-524288,262144,
 524288,1048576,2097152]