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A157643 as a simple table

na(n)
115
232457
3429687607
418760111396385
52007806646217026751
6441585560786152156144665
7177460844217161822403612174167
8119808489676348407935171406661046657

[15,32457,429687607,18760111396385,
 2007806646217026751,441585560786152156144665,
 177460844217161822403612174167,
 119808489676348407935171406661046657]