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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 10 |
| 3 | 100 |
| 4 | 1000 |
| 5 | 10000 |
| 6 | 11111 |
| 7 | 111110 |
| 8 | 1111100 |
| 9 | 11111000 |
| 10 | 111110000 |
[1,10,100,1000,10000,11111,111110,1111100, 11111000,111110000] |