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A094014 as a simple table

na(n)
01
1-2
28
3-16
464
5-128
6512
7-1024
84096
9-8192
1032768
11-65536
12262144
13-524288
142097152
15-4194304
1616777216
17-33554432
18134217728
19-268435456
201073741824
21-2147483648
228589934592
23-17179869184
2468719476736
25-137438953472

[1,-2,8,-16,64,-128,512,-1024,4096,-8192,32768,
 -65536,262144,-524288,2097152,-4194304,16777216,
 -33554432,134217728,-268435456,1073741824,
 -2147483648,8589934592,-17179869184,68719476736,
 -137438953472]