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A178885 as a simple table

na(n)
00
10
21
33
43
5-1
6-1
715
831
9-1
10-65
11-1
12255
13255
14-513
15-1025
161023
174095
18-1
19-12289
20-8193
2132767
2249151
23-65537
24-196609
2565535
26655359
27262143
28-1835009
29-2097153
304194303
319437183
32-6291457
33-33554433
34-4194305
35100663295
3683886079
37-251658241

[0,0,1,3,3,-1,-1,15,31,-1,-65,-1,255,255,-513,
 -1025,1023,4095,-1,-12289,-8193,32767,49151,
 -65537,-196609,65535,655359,262143,-1835009,
 -2097153,4194303,9437183,-6291457,-33554433,
 -4194305,100663295,83886079,-251658241]