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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 10 |
| 2 | 100 |
| 3 | 1000 |
| 4 | 11000 |
| 5 | 110000 |
| 6 | 1100000 |
| 7 | 11000000 |
| 8 | 110000000 |
| 9 | 1101000000 |
| 10 | 11110000000 |
| 11 | 111100000000 |
| 12 | 1111000000000 |
| 13 | 11110000000000 |
| 14 | 111100000000000 |
| 15 | 1111000000000000 |
| 16 | 11110000000000000 |
| 17 | 111100000000000000 |
| 18 | 1111000000000000000 |
| 19 | 11110111000000000000 |
[1,10,100,1000,11000,110000,1100000,11000000, 110000000,1101000000,11110000000,111100000000, 1111000000000,11110000000000,111100000000000, 1111000000000000,11110000000000000, 111100000000000000,1111000000000000000, 11110111000000000000] |