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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | -1 |
| 2 | -110 |
| 3 | -111000 |
| 4 | -1111000000 |
| 5 | -111110000000000 |
| 6 | -111111000000000000000 |
| 7 | -1111111000000000000000000000 |
| 8 | -111111110000000000000000000000000000 |
| 9 | -111111111000000000000000000000000000000000000 |
[0,-1,-110,-111000,-1111000000,-111110000000000, -111111000000000000000, -1111111000000000000000000000, -111111110000000000000000000000000000, -111111111000000000000000000000000000000000000] |