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A163031 as a simple table

na(n)
115
2245
35191
4104989
52075271
640792921
7801218515
815736428305
9309080891641
106070750256417
11119237718452471
122341990743046197
1345999883370408813
14903500281246849523
1517745974522766912147
16348555078644003475079

[15,245,5191,104989,2075271,40792921,801218515,
 15736428305,309080891641,6070750256417,
 119237718452471,2341990743046197,
 45999883370408813,903500281246849523,
 17745974522766912147,348555078644003475079]