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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 10 |
| 3 | 20 |
| 4 | 50 |
| 5 | 101 |
| 6 | 111 |
| 7 | 121 |
| 8 | 151 |
| 9 | 202 |
| 10 | 212 |
| 11 | 222 |
| 12 | 252 |
| 13 | 505 |
| 14 | 515 |
| 15 | 525 |
| 16 | 555 |
| 17 | 609 |
| 18 | 619 |
| 19 | 629 |
| 20 | 659 |
| 21 | 808 |
| 22 | 818 |
| 23 | 858 |
| 24 | 906 |
| 25 | 916 |
| 26 | 926 |
| 27 | 956 |
| 28 | 1001 |
| 29 | 1111 |
| 30 | 1221 |
| 31 | 1551 |
| 32 | 2002 |
| 33 | 2112 |
| 34 | 2222 |
[0,10,20,50,101,111,121,151,202,212,222,252,505, 515,525,555,609,619,629,659,808,818,858,906,916, 926,956,1001,1111,1221,1551,2002,2112,2222] |