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A225883 as a simple table

na(n)
00
11
2-3
37
4-15
531
6-63
7127
8-255
9511
10-1023
112047
12-4095
138191
14-16383
1532767
16-65535
17131071
18-262143
19524287
20-1048575
212097151
22-4194303
238388607
24-16777215
2533554431
26-67108863
27134217727
28-268435455
29536870911
30-1073741823
312147483647
32-4294967295

[0,1,-3,7,-15,31,-63,127,-255,511,-1023,2047,
 -4095,8191,-16383,32767,-65535,131071,-262143,
 524287,-1048575,2097151,-4194303,8388607,
 -16777215,33554431,-67108863,134217727,-268435455,
 536870911,-1073741823,2147483647,-4294967295]