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A183668 as a simple table

na(n)
1251991
2678265
32163831
47794409
530722151
6129866905
7580718871
82719942729
913245504711
1066684138745
11345524027511

[251991,678265,2163831,7794409,30722151,129866905,
 580718871,2719942729,13245504711,66684138745,
 345524027511]