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 | 9 |
| 2 | 49 |
| 3 | 333 |
| 4 | 2499 |
| 5 | 19999 |
| 6 | 166666 |
| 7 | 1428571 |
| 8 | 12499999 |
| 9 | 111111111 |
| 10 | 999999999 |
| 11 | 9090909090 |
| 12 | 83333333333 |
| 13 | 769230769230 |
| 14 | 7142857142857 |
| 15 | 66666666666666 |
| 16 | 624999999999999 |
| 17 | 5882352941176470 |
| 18 | 55555555555555555 |
| 19 | 526315789473684210 |
| 20 | 4999999999999999999 |
| 21 | 47619047619047619047 |