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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 22 |
| 3 | 333 |
| 4 | 4444 |
| 5 | 55555 |
| 6 | 666666 |
| 7 | 7777777 |
| 8 | 88888888 |
| 9 | 999999999 |
| 10 | 1 |
| 11 | 11 |
| 12 | 122 |
| 13 | 1333 |
| 14 | 14444 |
| 15 | 155555 |
| 16 | 1666666 |
| 17 | 17777777 |
| 18 | 188888888 |
| 19 | 1999999999 |
| 20 | 22 |
| 21 | 221 |
| 22 | 2222 |
| 23 | 22333 |
| 24 | 224444 |
| 25 | 2255555 |
| 26 | 22666666 |
| 27 | 227777777 |
| 28 | 2288888888 |
| 29 | 22999999999 |
| 30 | 333 |
| 31 | 3331 |
[1,22,333,4444,55555,666666,7777777,88888888, 999999999,1,11,122,1333,14444,155555,1666666, 17777777,188888888,1999999999,22,221,2222,22333, 224444,2255555,22666666,227777777,2288888888, 22999999999,333,3331] |