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A287100 as a simple table

na(n)
01
13
23
315
43
563
615
7255
815
91023
1015
114095
1215
1316383
14255
1565535
16251
17262143
18227
191048575
2027
214194303
2227
2316777215
24795
2567108863
26771
27268435455
28783
291073741823
3062415
314294967295
3262407
3317179869183
3461471
3568719476735
3650047
37274877906943

[1,3,3,15,3,63,15,255,15,1023,15,4095,15,16383,
 255,65535,251,262143,227,1048575,27,4194303,27,
 16777215,795,67108863,771,268435455,783,
 1073741823,62415,4294967295,62407,17179869183,
 61471,68719476735,50047,274877906943]