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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 111 |
| 3 | 0 |
| 4 | 11111 |
| 5 | 0 |
| 6 | 1111111 |
| 7 | 0 |
| 8 | 111111111 |
| 9 | 1000000 |
| 10 | 11101111111 |
| 11 | 100000000 |
| 12 | 1111111111111 |
| 13 | 10001000000 |
| 14 | 111111101111111 |
| 15 | 1001100000000 |
| 16 | 11101010111111111 |
| 17 | 100111001000000 |
| 18 | 1111101011101111111 |
| 19 | 11010001100000000 |
| 20 | 111110001110111111111 |
| 21 | 1100111001000000 |
[1,0,111,0,11111,0,1111111,0,111111111,1000000, 11101111111,100000000,1111111111111,10001000000, 111111101111111,1001100000000,11101010111111111, 100111001000000,1111101011101111111, 11010001100000000,111110001110111111111, 1100111001000000] |