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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 11 |
| 2 | 110 |
| 3 | 111 |
| 4 | 11100 |
| 5 | 111111 |
| 6 | 1111000 |
| 7 | 11111 |
| 8 | 111110000 |
| 9 | 111111111 |
| 10 | 11111100000 |
| 11 | 111001111111 |
| 12 | 1110111000000 |
| 13 | 1111111111111 |
| 14 | 111111110000000 |
| 15 | 1111100111111111 |
| 16 | 1111100000000 |
| 17 | 111111111111111111 |
| 18 | 1101111000000000 |
| 19 | 11111110011111111111 |
| 20 | 1111101110000000000 |
[1,11,110,111,11100,111111,1111000,11111, 111110000,111111111,11111100000,111001111111, 1110111000000,1111111111111,111111110000000, 1111100111111111,1111100000000,111111111111111111, 1101111000000000,11111110011111111111, 1111101110000000000] |