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 | 11 |
| 2 | 19 |
| 3 | 191 |
| 4 | 199 |
| 5 | 911 |
| 6 | 919 |
| 7 | 991 |
| 8 | 1999 |
| 9 | 9199 |
| 10 | 11119 |
| 11 | 19919 |
| 12 | 19991 |
| 13 | 91199 |
| 14 | 99119 |
| 15 | 99191 |
| 16 | 99991 |
| 17 | 111119 |
| 18 | 111191 |
| 19 | 111919 |
| 20 | 119191 |
| 21 | 191119 |
| 22 | 191911 |
| 23 | 191999 |
| 24 | 199999 |
| 25 | 911111 |
| 26 | 919111 |
| 27 | 991999 |
| 28 | 999199 |
| 29 | 1111991 |
| 30 | 1191119 |
| 31 | 1191191 |
| 32 | 1191199 |
| 33 | 1191991 |
| 34 | 1199999 |