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A099046 as a simple table

na(n)
01
12
230
3500
48750
5157500
62887500
753625000
81005468750
918992187500
10360851562500
116888984375000
12132038867187500
132539208984375000
1448970458984375000
15946762207031250000
1618343517761230468750
17356080050659179687500
186923778762817382812500

[1,2,30,500,8750,157500,2887500,53625000,
 1005468750,18992187500,360851562500,6888984375000,
 132038867187500,2539208984375000,
 48970458984375000,946762207031250000,
 18343517761230468750,356080050659179687500,
 6923778762817382812500]