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A120617 as a simple table

na(n)
01
1-2
2-4
38
416
5-32
6-64
7128
8256
9-512
10-1024
112048
124096
13-8192
14-16384
1532768
1665536
17-131072
18-262144
19524288
201048576
21-2097152
22-4194304
238388608
2416777216
25-33554432
26-67108864
27134217728
28268435456
29-536870912
30-1073741824
312147483648
324294967296
33-8589934592

[1,-2,-4,8,16,-32,-64,128,256,-512,-1024,2048,
 4096,-8192,-16384,32768,65536,-131072,-262144,
 524288,1048576,-2097152,-4194304,8388608,16777216,
 -33554432,-67108864,134217728,268435456,
 -536870912,-1073741824,2147483648,4294967296,
 -8589934592]