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 | 19 |
| 2 | 29 |
| 3 | 59 |
| 4 | 79 |
| 5 | 89 |
| 6 | 229 |
| 7 | 449 |
| 8 | 11119 |
| 9 | 22229 |
| 10 | 44449 |
| 11 | 111119 |
| 12 | 444449 |
| 13 | 11111119 |
| 14 | 55555559 |
| 15 | 555555555559 |
| 16 | 22222222222229 |
| 17 | 88888888888889 |
| 18 | 11111111111111119 |
| 19 | 88888888888888889 |
| 20 | 555555555555555559 |
| 21 | 55555555555555555555555559 |