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A257597 as a simple table

na(n)
11
21
3-1
41
5-3
61
7-7
81
91
10-15
115
121
13-31
1417
15-1
161
17-63
1849
19-7
201
21-127
22129
23-31
241
251
26-255
27321
28-111
299
301
31-511
32769
33-351
3449
35-1
361
37-1023
381793
39-1023
40209
41-11
421
43-2047
444097
45-2815
46769
47-71
481
491
50-4095
519217
52-7423
532561
54-351
5513
561
57-8191
5820481
59-18943
607937
61-1471
6297
63-1

[1,1,-1,1,-3,1,-7,1,1,-15,5,1,-31,17,-1,1,-63,49,
 -7,1,-127,129,-31,1,1,-255,321,-111,9,1,-511,769,
 -351,49,-1,1,-1023,1793,-1023,209,-11,1,-2047,
 4097,-2815,769,-71,1,1,-4095,9217,-7423,2561,-351,
 13,1,-8191,20481,-18943,7937,-1471,97,-1]