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A108520 as a simple table

na(n)
01
1-2
22
30
4-4
58
6-8
70
816
9-32
1032
110
12-64
13128
14-128
150
16256
17-512
18512
190
20-1024
212048
22-2048
230
244096
25-8192
268192
270
28-16384
2932768
30-32768
310
3265536
33-131072
34131072
350
36-262144
37524288
38-524288
390
401048576
41-2097152
422097152
430
44-4194304
458388608
46-8388608

[1,-2,2,0,-4,8,-8,0,16,-32,32,0,-64,128,-128,0,
 256,-512,512,0,-1024,2048,-2048,0,4096,-8192,8192,
 0,-16384,32768,-32768,0,65536,-131072,131072,0,
 -262144,524288,-524288,0,1048576,-2097152,2097152,
 0,-4194304,8388608,-8388608]