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A277395 as a simple table

na(n)
01
13
29
333
4145
5713
63745
720513
8115713
9667329
103916033
1123305857
12140327681
13853262465
145231925761
1532313686529
16200843829249
171255308123137
187884792852481
1949745076576257
20315091155558401
212003009460686849
2212774610185633793

[1,3,9,33,145,713,3745,20513,115713,667329,
 3916033,23305857,140327681,853262465,5231925761,
 32313686529,200843829249,1255308123137,
 7884792852481,49745076576257,315091155558401,
 2003009460686849,12774610185633793]