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A093250
as a simple table
n
a(n)
1
0
2
500
3
95000
4
9950000
5
999500000
6
99995000000
7
9999950000000
8
999999500000000
[0,500,95000,9950000,999500000,99995000000, 9999950000000,999999500000000]