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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 10 |
| 2 | 10 |
| 3 | 100 |
| 4 | 1100 |
| 5 | 11000 |
| 6 | 111000 |
| 7 | 1110000 |
| 8 | 11110000 |
| 9 | 111100000 |
| 10 | 1111100000 |
| 11 | 1111000000 |
| 12 | 11111000000 |
| 13 | 111110000000 |
| 14 | 11111110000000 |
| 15 | 11111100000000 |
| 16 | 111111100000000 |
| 17 | 11111111000000000 |
| 18 | 111111111000000000 |
| 19 | 1111111110000000000 |
| 20 | 11111111110000000000 |
[1,10,10,100,1100,11000,111000,1110000,11110000, 111100000,1111100000,1111000000,11111000000, 111110000000,11111110000000,11111100000000, 111111100000000,11111111000000000, 111111111000000000,1111111110000000000, 11111111110000000000] |