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A140683 as a simple table

na(n)
0-4
15
2-13
323
4-49
595
6-193
7383
8-769
91535
10-3073
116143
12-12289
1324575
14-49153
1598303
16-196609
17393215
18-786433
191572863
20-3145729
216291455
22-12582913
2325165823
24-50331649
25100663295
26-201326593
27402653183
28-805306369
291610612735
30-3221225473

[-4,5,-13,23,-49,95,-193,383,-769,1535,-3073,6143,
 -12289,24575,-49153,98303,-196609,393215,-786433,
 1572863,-3145729,6291455,-12582913,25165823,
 -50331649,100663295,-201326593,402653183,
 -805306369,1610612735,-3221225473]