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A290551 as a simple table

na(n)
01
11
25
315
419
563
67
7255
815
91023
101951
114095
1263
1316383
14127
1565535
16255
17262143
1814847
191048575
201023
214194303
2267583
2316777215
244095
2567108863
268191
27268435455
288404991
291073741823
30100696063
314294967295
3216842751
3317179869183
344298768383
3568719476735

[1,1,5,15,19,63,7,255,15,1023,1951,4095,63,16383,
 127,65535,255,262143,14847,1048575,1023,4194303,
 67583,16777215,4095,67108863,8191,268435455,
 8404991,1073741823,100696063,4294967295,16842751,
 17179869183,4298768383,68719476735]