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A089989 as a simple table

na(n)
05
115000
229250000000
335703281250000000000
427239372138671875000000000000000
512988743471794208526611328125000000000000000000
63870947187719439049405530095100402832031250000000000000000000000
7721020100095350865678782984846420731628313660621643066406250000000000000000000000000

[5,15000,29250000000,35703281250000000000,
 27239372138671875000000000000000,
 12988743471794208526611328125000000000000000000,
 38709471877194390494055300951004028320312500000000\
 00000000000000,
 72102010009535086567878298484642073162831366062164\
 3066406250000000000000000000000000]