This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 199 |
| 2 | 991 |
| 3 | 91199 |
| 4 | 99119 |
| 5 | 111119 |
| 6 | 111919 |
| 7 | 119191 |
| 8 | 191911 |
| 9 | 911111 |
| 10 | 919111 |
| 11 | 991999 |
| 12 | 999199 |
| 13 | 1191119 |
| 14 | 1191191 |
| 15 | 1191991 |
| 16 | 1911911 |
| 17 | 1991911 |
| 18 | 9111911 |
| 19 | 11111911 |
| 20 | 11191991 |
| 21 | 11911111 |
| 22 | 11919991 |
| 23 | 19111991 |
| 24 | 19911191 |
| 25 | 19919111 |
| 26 | 19991911 |