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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 800 |
| 3 | 98000 |
| 4 | 9980000 |
| 5 | 999800000 |
| 6 | 99998000000 |
| 7 | 9999980000000 |
| 8 | 999999800000000 |
| 9 | 99999998000000000 |
| 10 | 9999999980000000000 |
| 11 | 999999999800000000000 |
| 12 | 99999999998000000000000 |
| 13 | 9999999999980000000000000 |
| 14 | 999999999999800000000000000 |
| 15 | 99999999999998000000000000000 |
[0,800,98000,9980000,999800000,99998000000, 9999980000000,999999800000000,99999998000000000, 9999999980000000000,999999999800000000000, 99999999998000000000000,9999999999980000000000000, 999999999999800000000000000, 99999999999998000000000000000] |