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A078260 as a simple table

na(n)
15
225
3500
42500
5100000
625000000
75000000000
8125000000000
950000000000000
10500000000000000
11500000000000000000
126250000000000000000
135000000000000000000000
14250000000000000000000000
1510000000000000000000000000
161250000000000000000000000000
17500000000000000000000000000000

[5,25,500,2500,100000,25000000,5000000000,
 125000000000,50000000000000,500000000000000,
 500000000000000000,6250000000000000000,
 5000000000000000000000,250000000000000000000000,
 10000000000000000000000000,
 1250000000000000000000000000,
 500000000000000000000000000000]