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A248155 as a simple table

na(n)
01
1-2
23
3-5
49
5-17
633
7-65
8129
9-257
10513
11-1025
122049
13-4097
148193
15-16385
1632769
17-65537
18131073
19-262145
20524289
21-1048577
222097153
23-4194305
248388609
25-16777217
2633554433
27-67108865
28134217729
29-268435457
30536870913

[1,-2,3,-5,9,-17,33,-65,129,-257,513,-1025,2049,
 -4097,8193,-16385,32769,-65537,131073,-262145,
 524289,-1048577,2097153,-4194305,8388609,
 -16777217,33554433,-67108865,134217729,-268435457,
 536870913]