The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 991 |
| 2 | 99119 |
| 3 | 191911 |
| 4 | 911111 |
| 5 | 919111 |
| 6 | 999199 |
| 7 | 1911911 |
| 8 | 1991911 |
| 9 | 9111911 |
| 10 | 11911111 |
| 11 | 19911191 |
| 12 | 19919111 |
| 13 | 19991911 |
| 14 | 99111119 |
| 15 | 911111191 |
| 16 | 991111111 |
| 17 | 991991111 |
| 18 | 999199991 |
| 19 | 999919919 |
| 20 | 1911119911 |
| 21 | 1919991191 |
| 22 | 1991111911 |
| 23 | 1991919191 |
[991,99119,191911,911111,919111,999199,1911911, 1991911,9111911,11911111,19911191,19919111, 19991911,99111119,911111191,991111111,991991111, 999199991,999919919,1911119911,1919991191, 1991111911,1991919191] |