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| n | a(n) |
|---|---|
| 1 | 10 |
| 2 | 20 |
| 3 | 111 |
| 4 | 120 |
| 5 | 1000 |
| 6 | 10000 |
| 7 | 10000000000000000000 |
| 8 | 10000000800000000000 |
| 9 | 13999999999999999999 |
| 10 | 99999999911111111111 |
| 11 | 111110000000000000000 |
| 12 | 111112999999999999999 |
| 13 | 999999999999999999999 |
| 14 | 9999999999999999999999 |
[10,20,111,120,1000,10000,10000000000000000000, 10000000800000000000,13999999999999999999, 99999999911111111111,111110000000000000000, 111112999999999999999,999999999999999999999, 9999999999999999999999] |