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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 10 |
| 2 | 101 |
| 3 | 1111 |
| 4 | 11001 |
| 5 | 111111 |
| 6 | 1110000 |
| 7 | 11111111 |
| 8 | 111100000 |
| 9 | 1111111111 |
| 10 | 11111001111 |
| 11 | 111111111111 |
| 12 | 1111110000000 |
| 13 | 11111111111111 |
| 14 | 111111100000000 |
| 15 | 1111111111111111 |
| 16 | 11111111000000000 |
| 17 | 111111111111111111 |
| 18 | 1111111110011100000 |
| 19 | 11111111111111111111 |
[1,10,101,1111,11001,111111,1110000,11111111, 111100000,1111111111,11111001111,111111111111, 1111110000000,11111111111111,111111100000000, 1111111111111111,11111111000000000, 111111111111111111,1111111110011100000, 11111111111111111111] |