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A279882 as a simple table

na(n)
17
215
363
4255
54095
616383
7262143
81048575
916777215
101073741823
114294967295
12274877906943
134398046511103
1417592186044415
15281474976710655
1618014398509481983
171152921504606846975
184611686018427387903
19295147905179352825855
204722366482869645213695

[7,15,63,255,4095,16383,262143,1048575,16777215,
 1073741823,4294967295,274877906943,4398046511103,
 17592186044415,281474976710655,18014398509481983,
 1152921504606846975,4611686018427387903,
 295147905179352825855,4722366482869645213695]