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 | 11 |
| 2 | 222 |
| 3 | 3333 |
| 4 | 44444 |
| 5 | 555555 |
| 6 | 6666666 |
| 7 | 77777777 |
| 8 | 888888888 |
| 9 | 9999999999 |
| 10 | 11888888888 |
| 11 | 119999999999 |
| 12 | 222888888888 |
| 13 | 2229999999999 |
| 14 | 3333888888888 |
| 15 | 33339999999999 |
| 16 | 44444888888888 |
| 17 | 444449999999999 |
| 18 | 555555888888888 |
| 19 | 5555559999999999 |
| 20 | 6666666888888888 |