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| 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] |