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A282123 as a simple table

na(n)
01
13
26
315
426
563
6106
7255
8426
91023
101706
114095
126826
1316383
1427306
1565535
16109226
17262143
18436906
191048575
201747626
214194303
226990506
2316777215
2427962026
2567108863
26111848106
27268435455
28447392426
291073741823
301789569706
314294967295
327158278826

[1,3,6,15,26,63,106,255,426,1023,1706,4095,6826,
 16383,27306,65535,109226,262143,436906,1048575,
 1747626,4194303,6990506,16777215,27962026,
 67108863,111848106,268435455,447392426,1073741823,
 1789569706,4294967295,7158278826]