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A281500 as a simple table

na(n)
02
13
214
315
462
563
6254
7255
81022
91023
104094
114095
1216382
1316383
1465534
1565535
16262142
17262143
181048574
191048575
204194302
214194303
2216777214
2316777215
2467108862
2567108863
26268435454
27268435455
281073741822
291073741823
304294967294
314294967295
3217179869182
3317179869183

[2,3,14,15,62,63,254,255,1022,1023,4094,4095,
 16382,16383,65534,65535,262142,262143,1048574,
 1048575,4194302,4194303,16777214,16777215,
 67108862,67108863,268435454,268435455,1073741822,
 1073741823,4294967294,4294967295,17179869182,
 17179869183]