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 | 55 |
| 2 | 595 |
| 3 | 5995 |
| 4 | 7779577597795 |
| 5 | 9775779559755 |
| 6 | 57575799959759975575 |
| 7 | 77777755779995957575 |
| 8 | 7577959575775997959995995979795 |