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A285947 as a simple table

na(n)
01
13
23
315
46
563
612
7255
824
91023
1048
114095
1296
1316383
14192
1565535
16384
17262143
18768
191048575
201536
214194303
223072
2316777215
246144
2567108863
2612288
27268435455
2824606
291073741823
3049214
314294967295
3298366
3317179869183
34196670
3568719476735
36393278

[1,3,3,15,6,63,12,255,24,1023,48,4095,96,16383,
 192,65535,384,262143,768,1048575,1536,4194303,
 3072,16777215,6144,67108863,12288,268435455,24606,
 1073741823,49214,4294967295,98366,17179869183,
 196670,68719476735,393278]