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A165800 as a simple table

na(n)
01
150
22500
3125000
46250000
5312500000
615625000000
7781250000000
839062500000000
91953125000000000
1097656250000000000
114882812500000000000
12244140625000000000000
1312207031250000000000000
14610351562500000000000000

[1,50,2500,125000,6250000,312500000,15625000000,
 781250000000,39062500000000,1953125000000000,
 97656250000000000,4882812500000000000,
 244140625000000000000,12207031250000000000000,
 610351562500000000000000]