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A083943 as a simple table

na(n)
00
11
2-1
3-1
4-5
5-9
6-21
7-41
8-85
9-169
10-341
11-681
12-1365
13-2729
14-5461
15-10921
16-21845
17-43689
18-87381
19-174761
20-349525
21-699049
22-1398101
23-2796201
24-5592405
25-11184809
26-22369621
27-44739241
28-89478485
29-178956969
30-357913941
31-715827881
32-1431655765

[0,1,-1,-1,-5,-9,-21,-41,-85,-169,-341,-681,-1365,
 -2729,-5461,-10921,-21845,-43689,-87381,-174761,
 -349525,-699049,-1398101,-2796201,-5592405,
 -11184809,-22369621,-44739241,-89478485,
 -178956969,-357913941,-715827881,-1431655765]