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A137206 as a simple table

na(n)
00
12
2-1
34
4-2
58
6-4
716
8-8
932
10-16
1164
12-32
13128
14-64
15256
16-128
17512
18-256
191024
20-512
212048
22-1024
234096
24-2048
258192
26-4096
2716384
28-8192
2932768
30-16384
3165536
32-32768
33131072
34-65536
35262144
36-131072
37524288
38-262144
391048576
40-524288

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