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A176691 as a simple table

na(n)
02
15
29
315
425
543
677
7143
8273
9531
101045
112071
124121
138219
1416413
1532799
1665569
17131107
18262181
19524327
201048617
212097195
224194349
238388655
2416777265
2533554483
2667108917
27134217783
28268435513
29536870971
301073741885
312147483711
324294967361
338589934659
3417179869253

[2,5,9,15,25,43,77,143,273,531,1045,2071,4121,
 8219,16413,32799,65569,131107,262181,524327,
 1048617,2097195,4194349,8388655,16777265,33554483,
 67108917,134217783,268435513,536870971,1073741885,
 2147483711,4294967361,8589934659,17179869253]