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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 10 |
| 2 | 110 |
| 3 | 1100 |
| 4 | 11100 |
| 5 | 111000 |
| 6 | 1111000 |
| 7 | 11110000 |
| 8 | 111110000 |
| 9 | 1111100000 |
| 10 | 11111100000 |
| 11 | 111111000000 |
| 12 | 1111111000000 |
| 13 | 11111110000000 |
| 14 | 111111110000000 |
| 15 | 1111111100000000 |
| 16 | 11111111100000000 |
| 17 | 111111111000000000 |
| 18 | 1111111111000000000 |
| 19 | 11111111110000000000 |
[1,10,110,1100,11100,111000,1111000,11110000, 111110000,1111100000,11111100000,111111000000, 1111111000000,11111110000000,111111110000000, 1111111100000000,11111111100000000, 111111111000000000,1111111111000000000, 11111111110000000000] |