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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | 4 |
| 3 | 6 |
| 4 | 8 |
| 5 | 10 |
| 6 | 12 |
| 7 | 14 |
| 8 | 16 |
| 9 | 18 |
| 10 | 101 |
| 11 | 202 |
| 12 | 303 |
| 13 | 404 |
| 14 | 505 |
| 15 | 606 |
| 16 | 707 |
| 17 | 808 |
| 18 | 909 |
| 19 | 1010 |
| 20 | 202 |
| 21 | 303 |
| 22 | 404 |
| 23 | 505 |
| 24 | 606 |
| 25 | 707 |
| 26 | 808 |
| 27 | 909 |
| 28 | 1010 |
| 29 | 1111 |
| 30 | 303 |
| 31 | 404 |
| 32 | 505 |
| 33 | 606 |
| 34 | 707 |
| 35 | 808 |
| 36 | 909 |
| 37 | 1010 |
| 38 | 1111 |
| 39 | 1212 |
| 40 | 404 |
| 41 | 505 |
| 42 | 606 |
| 43 | 707 |
| 44 | 808 |
| 45 | 909 |
| 46 | 1010 |
| 47 | 1111 |
| 48 | 1212 |
| 49 | 1313 |
| 50 | 505 |
[0,2,4,6,8,10,12,14,16,18,101,202,303,404,505,606, 707,808,909,1010,202,303,404,505,606,707,808,909, 1010,1111,303,404,505,606,707,808,909,1010,1111, 1212,404,505,606,707,808,909,1010,1111,1212,1313, 505] |