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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 10 |
| 2 | 111 |
| 3 | 1111 |
| 4 | 11100 |
| 5 | 111100 |
| 6 | 1111111 |
| 7 | 11111110 |
| 8 | 111111110 |
| 9 | 1111111101 |
| 10 | 11111110100 |
| 11 | 111111110111 |
| 12 | 1111111101011 |
| 13 | 11111111100011 |
| 14 | 111111111011011 |
| 15 | 1111111111011111 |
| 16 | 11111111101011000 |
| 17 | 111111111100111000 |
| 18 | 1111111111101011111 |
| 19 | 11111111111110011111 |
[1,10,111,1111,11100,111100,1111111,11111110, 111111110,1111111101,11111110100,111111110111, 1111111101011,11111111100011,111111111011011, 1111111111011111,11111111101011000, 111111111100111000,1111111111101011111, 11111111111110011111] |