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A287462 as a simple table

na(n)
01
13
21
312
43
560
63
7255
80
91023
100
114095
123
1316380
143
1565535
160
17262137
185
191048569
201
214194297
225
2316777201
2415
2567108849
2612
27268435451
2824
291073741823
300
314294967295
3231
3317179869124
3431
3568719476684
367
37274877906892
3847
391099511627724
4015

[1,3,1,12,3,60,3,255,0,1023,0,4095,3,16380,3,
 65535,0,262137,5,1048569,1,4194297,5,16777201,15,
 67108849,12,268435451,24,1073741823,0,4294967295,
 31,17179869124,31,68719476684,7,274877906892,47,
 1099511627724,15]