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A155599 as a simple table

na(n)
01
17
261
3505
44081
532737
6262081
72097025
816776961
9134217217
101073740801
118589932545
1268719472641
13549755805697
144398046494721
1535184372056065
16281474976645121
172251799813554177
1818014398509219841
19144115188075331585

[1,7,61,505,4081,32737,262081,2097025,16776961,
 134217217,1073740801,8589932545,68719472641,
 549755805697,4398046494721,35184372056065,
 281474976645121,2251799813554177,
 18014398509219841,144115188075331585]