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A258807 as a simple table

na(n)
10
231
3242
41023
53124
67775
716806
832767
959048
1099999
11161050
12248831
13371292
14537823
15759374
161048575
171419856
181889567
192476098
203199999
214084100
225153631
236436342
247962623
259765624
2611881375
2714348906
2817210367
2920511148
3024299999
3128629150
3233554431

[0,31,242,1023,3124,7775,16806,32767,59048,99999,
 161050,248831,371292,537823,759374,1048575,
 1419856,1889567,2476098,3199999,4084100,5153631,
 6436342,7962623,9765624,11881375,14348906,
 17210367,20511148,24299999,28629150,33554431]