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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 10 |
| 2 | 110 |
| 3 | 1111 |
| 4 | 11111 |
| 5 | 111100 |
| 6 | 1111100 |
| 7 | 11111110 |
| 8 | 111111110 |
| 9 | 1111110111 |
| 10 | 11111110111 |
| 11 | 111111111000 |
| 12 | 1111111111000 |
| 13 | 11111111111000 |
| 14 | 111111111111000 |
| 15 | 1111111111111000 |
| 16 | 11111111111111000 |
| 17 | 111111111100111000 |
| 18 | 1111111111100111000 |
| 19 | 11111111111110111000 |
[1,10,110,1111,11111,111100,1111100,11111110, 111111110,1111110111,11111110111,111111111000, 1111111111000,11111111111000,111111111111000, 1111111111111000,11111111111111000, 111111111100111000,1111111111100111000, 11111111111110111000] |