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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 80 |
| 3 | 970 |
| 4 | 9960 |
| 5 | 99950 |
| 6 | 999940 |
| 7 | 9999930 |
| 8 | 99999920 |
| 9 | 999999910 |
| 10 | 9999999900 |
| 11 | 99999999890 |
| 12 | 999999999880 |
| 13 | 9999999999870 |
| 14 | 99999999999860 |
| 15 | 999999999999850 |
| 16 | 9999999999999840 |
| 17 | 99999999999999830 |
| 18 | 999999999999999820 |
| 19 | 9999999999999999810 |
| 20 | 99999999999999999800 |
| 21 | 999999999999999999790 |
[1,0,80,970,9960,99950,999940,9999930,99999920, 999999910,9999999900,99999999890,999999999880, 9999999999870,99999999999860,999999999999850, 9999999999999840,99999999999999830, 999999999999999820,9999999999999999810, 99999999999999999800,999999999999999999790] |