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A063768 as a simple table

na(n)
02
111
267
3521
44099
532771
6262147
72097169
816777259
9134217757
101073741827
118589934609
1268719476767
13549755813911
144398046511119
1535184372088891
16281474976710677
172251799813685269
1818014398509482143
19144115188075855881

[2,11,67,521,4099,32771,262147,2097169,16777259,
 134217757,1073741827,8589934609,68719476767,
 549755813911,4398046511119,35184372088891,
 281474976710677,2251799813685269,
 18014398509482143,144115188075855881]