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 | 59 |
| 2 | 55599959 |
| 3 | 99555959 |
| 4 | 5555995999 |
| 5 | 5559999559 |
| 6 | 5595959959 |
| 7 | 5595999559 |
| 8 | 5599595959 |
| 9 | 5599959559 |
| 10 | 5955559999 |
| 11 | 5955599959 |
| 12 | 5959559959 |
| 13 | 5959599559 |
| 14 | 5995559599 |
| 15 | 5995559959 |
| 16 | 5995995559 |
| 17 | 5999555959 |
| 18 | 9555599959 |
| 19 | 9555959599 |
| 20 | 9555995959 |
| 21 | 9555999559 |
| 22 | 9559595599 |