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A084241 as a simple table

na(n)
00
11
2-5
321
4-85
5341
6-1365
75461
8-21845
987381
10-349525
111398101
12-5592405
1322369621
14-89478485
15357913941
16-1431655765
175726623061
18-22906492245
1991625968981
20-366503875925
211466015503701
22-5864062014805
2323456248059221
24-93824992236885

[0,1,-5,21,-85,341,-1365,5461,-21845,87381,
 -349525,1398101,-5592405,22369621,-89478485,
 357913941,-1431655765,5726623061,-22906492245,
 91625968981,-366503875925,1466015503701,
 -5864062014805,23456248059221,-93824992236885]