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A162459 as a simple table

na(n)
11
20
3-4
4-8
5-32
6-32
7-128
8-256
9-512
10-512
11-2048
12-4096
13-12288
14-16384
15-16384
16-32768
17-131072
18-262144
19-786432
20-1572864
21-2097152
22-2097152
23-8388608
24-16777216
25-33554432
26-33554432
27-67108864
28-134217728
29-536870912
30-1610612736
31-4294967296

[1,0,-4,-8,-32,-32,-128,-256,-512,-512,-2048,
 -4096,-12288,-16384,-16384,-32768,-131072,-262144,
 -786432,-1572864,-2097152,-2097152,-8388608,
 -16777216,-33554432,-33554432,-67108864,
 -134217728,-536870912,-1610612736,-4294967296]