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A280415 as a simple table

na(n)
01
13
24
314
417
557
665
7227
8260
9910
101025
113585
124097
1314337
1416385
1557345
1665537
17229377
18262145
19917505
201048577
213670017
224194305
2314680065
2416777217
2558720257
2667108865
27234881025
28268435457
29939524099
301073741824
313758096384
324294967296
3315032385536

[1,3,4,14,17,57,65,227,260,910,1025,3585,4097,
 14337,16385,57345,65537,229377,262145,917505,
 1048577,3670017,4194305,14680065,16777217,
 58720257,67108865,234881025,268435457,939524099,
 1073741824,3758096384,4294967296,15032385536]