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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 11 |
| 2 | 11 |
| 3 | 1111 |
| 4 | 1011 |
| 5 | 111111 |
| 6 | 101011 |
| 7 | 11111111 |
| 8 | 10101011 |
| 9 | 1111111111 |
| 10 | 1010101011 |
| 11 | 111111111111 |
| 12 | 101010101011 |
| 13 | 11111111111111 |
| 14 | 11101010101011 |
| 15 | 1101111111111111 |
| 16 | 100101010101011 |
| 17 | 11111111111111111 |
| 18 | 1101010111010101011 |
| 19 | 111110001111111111 |
| 20 | 10111010101010101011 |
[1,11,11,1111,1011,111111,101011,11111111, 10101011,1111111111,1010101011,111111111111, 101010101011,11111111111111,11101010101011, 1101111111111111,100101010101011, 11111111111111111,1101010111010101011, 111110001111111111,10111010101010101011] |