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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 100 |
| 3 | 11 |
| 4 | 10000 |
| 5 | 1111 |
| 6 | 1000000 |
| 7 | 111111 |
| 8 | 100000000 |
| 9 | 11111111 |
| 10 | 10000000000 |
| 11 | 1111111111 |
| 12 | 1000000000000 |
| 13 | 111111111111 |
| 14 | 100000000000000 |
| 15 | 11111111111111 |
| 16 | 10000000000000000 |
| 17 | 1111111111111111 |
| 18 | 1000000000000000000 |
| 19 | 111111111111111111 |
| 20 | 100000000000000000000 |
[1,0,100,11,10000,1111,1000000,111111,100000000, 11111111,10000000000,1111111111,1000000000000, 111111111111,100000000000000,11111111111111, 10000000000000000,1111111111111111, 1000000000000000000,111111111111111111, 100000000000000000000] |