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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 4 |
| 6 | 5 |
| 7 | 6 |
| 8 | 7 |
| 9 | 8 |
| 10 | 9 |
| 11 | 19 |
| 12 | 29 |
| 13 | 39 |
| 14 | 49 |
| 15 | 59 |
| 16 | 69 |
| 17 | 79 |
| 18 | 99 |
| 19 | 199 |
| 20 | 299 |
| 21 | 399 |
| 22 | 499 |
| 23 | 599 |
| 24 | 699 |
| 25 | 799 |
| 26 | 999 |
| 27 | 1999 |
| 28 | 2999 |
| 29 | 3999 |
| 30 | 4999 |
| 31 | 5999 |
| 32 | 6999 |
| 33 | 7999 |
| 34 | 9999 |
| 35 | 19999 |
| 36 | 29999 |
| 37 | 39999 |
| 38 | 49999 |
| 39 | 59999 |
| 40 | 69999 |
| 41 | 79999 |
| 42 | 99999 |
| 43 | 199999 |
| 44 | 299999 |
| 45 | 399999 |
[0,1,2,3,4,5,6,7,8,9,19,29,39,49,59,69,79,99,199, 299,399,499,599,699,799,999,1999,2999,3999,4999, 5999,6999,7999,9999,19999,29999,39999,49999,59999, 69999,79999,99999,199999,299999,399999] |