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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 11 |
| 3 | 101 |
| 4 | 1111 |
| 5 | 11111 |
| 6 | 101101 |
| 7 | 1110111 |
| 8 | 11100111 |
| 9 | 101000101 |
| 10 | 1111001111 |
| 11 | 11111011111 |
| 12 | 101101101101 |
| 13 | 1111111111111 |
| 14 | 11111111111111 |
| 15 | 101101101101101 |
| 16 | 1110111111110111 |
| 17 | 11100111111100111 |
| 18 | 101000101101000101 |
| 19 | 1111001110111001111 |
| 20 | 11111011100111011111 |
| 21 | 101101101000101101101 |
[1,11,101,1111,11111,101101,1110111,11100111, 101000101,1111001111,11111011111,101101101101, 1111111111111,11111111111111,101101101101101, 1110111111110111,11100111111100111, 101000101101000101,1111001110111001111, 11111011100111011111,101101101000101101101] |