The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 11 |
| 2 | 110 |
| 3 | 1111 |
| 4 | 1100 |
| 5 | 111111 |
| 6 | 11000 |
| 7 | 11111111 |
| 8 | 110000 |
| 9 | 1111111111 |
| 10 | 1100000 |
| 11 | 111111111111 |
| 12 | 11000000 |
| 13 | 11111111111111 |
| 14 | 110000000 |
| 15 | 1111111111111111 |
| 16 | 1100000000 |
| 17 | 111111111111111111 |
| 18 | 11000000000 |
| 19 | 11111111111111111111 |
| 20 | 110000000000 |
| 21 | 1111111111111111111111 |
[1,11,110,1111,1100,111111,11000,11111111,110000, 1111111111,1100000,111111111111,11000000, 11111111111111,110000000,1111111111111111, 1100000000,111111111111111111,11000000000, 11111111111111111111,110000000000, 1111111111111111111111] |