The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 11 |
| 2 | 1 |
| 3 | 111 |
| 4 | 10001 |
| 5 | 100111 |
| 6 | 1000001 |
| 7 | 11000111 |
| 8 | 1000001 |
| 9 | 111000111 |
| 10 | 10000000001 |
| 11 | 100000000111 |
| 12 | 1000000000001 |
| 13 | 10000000000111 |
| 14 | 100000000000001 |
| 15 | 1000000000000111 |
| 16 | 10000000000000001 |
| 17 | 100000000000000111 |
| 18 | 1000000000000000001 |
| 19 | 10000000000000000111 |
[1,11,1,111,10001,100111,1000001,11000111,1000001, 111000111,10000000001,100000000111,1000000000001, 10000000000111,100000000000001,1000000000000111, 10000000000000001,100000000000000111, 1000000000000000001,10000000000000000111] |