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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 0 |
| 3 | 11 |
| 4 | 10000 |
| 5 | 111 |
| 6 | 1100000 |
| 7 | 1111 |
| 8 | 1000000 |
| 9 | 1000011111 |
| 10 | 0 |
| 11 | 100100111111 |
| 12 | 10100000000 |
| 13 | 10000001111111 |
| 14 | 0 |
| 15 | 1111110011111111 |
| 16 | 10000000000 |
| 17 | 110010000111111111 |
| 18 | 1000000000000000 |
| 19 | 11000011001111111111 |
| 20 | 110001000000000000 |
| 21 | 1000011111111111 |
[1,1,0,11,10000,111,1100000,1111,1000000, 1000011111,0,100100111111,10100000000, 10000001111111,0,1111110011111111,10000000000, 110010000111111111,1000000000000000, 11000011001111111111,110001000000000000, 1000011111111111] |