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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 101 |
| 3 | 11 |
| 4 | 10111 |
| 5 | 1111 |
| 6 | 1011111 |
| 7 | 111111 |
| 8 | 101111111 |
| 9 | 11111111 |
| 10 | 10111111111 |
| 11 | 1111111111 |
| 12 | 1011111111111 |
| 13 | 111111111111 |
| 14 | 101111111111111 |
| 15 | 11111111111111 |
| 16 | 10111111111111111 |
| 17 | 1111111111111111 |
| 18 | 1011111111111111111 |
| 19 | 111111111111111111 |
| 20 | 101111111111111111111 |
[1,0,101,11,10111,1111,1011111,111111,101111111, 11111111,10111111111,1111111111,1011111111111, 111111111111,101111111111111,11111111111111, 10111111111111111,1111111111111111, 1011111111111111111,111111111111111111, 101111111111111111111] |