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) |
|---|---|
| 0 | 1 |
| 1 | 333 |
| 2 | 55555 |
| 3 | 7777777 |
| 4 | 999999999 |
| 5 | 11111111111 |
| 6 | 3333333333333 |
| 7 | 555555555555555 |
| 8 | 77777777777777777 |
| 9 | 9999999999999999999 |
| 10 | 111111111111111111111 |
| 11 | 33333333333333333333333 |