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A287751 as a simple table

na(n)
01
13
21
314
41
563
60
7255
81
91022
103
114092
123
1316380
1411
1565527
168
17262135
189
191048566
2013
214194291
2212
2316777203
2412
2567108859
267
27268435448
2871
291073741759
30224
314294967071
32228
3317179869051
34132
3568719476603
36388
37274877906687
38320
391099511627455
40339

[1,3,1,14,1,63,0,255,1,1022,3,4092,3,16380,11,
 65527,8,262135,9,1048566,13,4194291,12,16777203,
 12,67108859,7,268435448,71,1073741759,224,
 4294967071,228,17179869051,132,68719476603,388,
 274877906687,320,1099511627455,339]