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A093146 as a simple table

na(n)
01
15
250
3750
412500
5212500
63625000
761875000
81056250000
918031250000
10307812500000
115254687500000
1289703125000000
131531328125000000
1426141406250000000
15446261718750000000
167618164062500000000

[1,5,50,750,12500,212500,3625000,61875000,
 1056250000,18031250000,307812500000,5254687500000,
 89703125000000,1531328125000000,26141406250000000,
 446261718750000000,7618164062500000000]