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A122803 as a simple table

na(n)
01
1-2
24
3-8
416
5-32
664
7-128
8256
9-512
101024
11-2048
124096
13-8192
1416384
15-32768
1665536
17-131072
18262144
19-524288
201048576
21-2097152
224194304
23-8388608
2416777216
25-33554432
2667108864
27-134217728
28268435456
29-536870912
301073741824
31-2147483648
324294967296
33-8589934592
3417179869184

[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,
 -8589934592,17179869184]