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A247838 as a simple table

na(n)
13
22667
33937
457337
5172011
6253921
7677207307
81073602561
9732959441001382539
10750688035198863979
111000923107604038521
121108158528150703969

[3,2667,3937,57337,172011,253921,677207307,
 1073602561,732959441001382539,750688035198863979,
 1000923107604038521,1108158528150703969]