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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 10 |
| 3 | 111 |
| 4 | 1212 |
| 5 | 50505 |
| 6 | 101010 |
| 7 | 7070707 |
| 8 | 16161616 |
| 9 | 111111111 |
| 10 | 1010101010 |
| 11 | 29292929292 |
| 12 | 121212121212 |
| 13 | 0 |
| 14 | 14141414141414 |
| 15 | 525252525252525 |
| 16 | 1616161616161616 |
| 17 | 0 |
| 18 | 101010101010101010 |
| 19 | 0 |
| 20 | 20202020202020202020 |
[1,10,111,1212,50505,101010,7070707,16161616, 111111111,1010101010,29292929292,121212121212,0, 14141414141414,525252525252525,1616161616161616,0, 101010101010101010,0,20202020202020202020] |