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A077925 as a simple table

na(n)
01
1-1
23
3-5
411
5-21
643
7-85
8171
9-341
10683
11-1365
122731
13-5461
1410923
15-21845
1643691
17-87381
18174763
19-349525
20699051
21-1398101
222796203
23-5592405
2411184811
25-22369621
2644739243
27-89478485
28178956971
29-357913941
30715827883
31-1431655765
322863311531
33-5726623061

[1,-1,3,-5,11,-21,43,-85,171,-341,683,-1365,2731,
 -5461,10923,-21845,43691,-87381,174763,-349525,
 699051,-1398101,2796203,-5592405,11184811,
 -22369621,44739243,-89478485,178956971,-357913941,
 715827883,-1431655765,2863311531,-5726623061]