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 | 45 |
| 2 | 55 |
| 3 | 595 |
| 4 | 5995 |
| 5 | 49455 |
| 6 | 55945 |
| 7 | 594595 |
| 8 | 5559445 |
| 9 | 555594445 |
| 10 | 9955945495 |
| 11 | 55555944445 |
| 12 | 95444955595 |
| 13 | 5555559444445 |
| 14 | 9545454599955 |
| 15 | 499594959455595 |
| 16 | 549999555454495 |
| 17 | 555555594444445 |
| 18 | 55555555944444445 |
| 19 | 5555555559444444445 |
| 20 | 5999995494459499455 |