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 | 71 |
| 2 | 229 |
| 3 | 7333 |
| 4 | 44449 |
| 5 | 555557 |
| 6 | 0 |
| 7 | 77777747 |
| 8 | 888888887 |
| 9 | 9999999929 |