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A084633 as a simple table

na(n)
01
10
22
3-4
48
5-16
632
7-64
8128
9-256
10512
11-1024
122048
13-4096
148192
15-16384
1632768
17-65536
18131072
19-262144
20524288
21-1048576
222097152
23-4194304
248388608
25-16777216
2633554432
27-67108864
28134217728
29-268435456
30536870912
31-1073741824
322147483648
33-4294967296

[1,0,2,-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]