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A257103 as a simple table

na(n)
121
256
31862
42526
51352797
62201422
73206062
834844422
942400318
108586830293
1120967471193
1223194695022
1343790421673
1445041812729
1548438881254
16101060544853
17177839630854
18180939891343
19198419358598
20305550990673
21354694083622
22661663823662
23785220739279

[21,56,1862,2526,1352797,2201422,3206062,34844422,
 42400318,8586830293,20967471193,23194695022,
 43790421673,45041812729,48438881254,101060544853,
 177839630854,180939891343,198419358598,
 305550990673,354694083622,661663823662,
 785220739279]