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 | 1 |
| 2 | 3 |
| 3 | 9 |
| 4 | 11 |
| 5 | 33 |
| 6 | 99 |
| 7 | 111 |
| 8 | 333 |
| 9 | 999 |
| 10 | 1111 |
| 11 | 3333 |
| 12 | 9999 |
| 13 | 11111 |
| 14 | 33333 |
| 15 | 99999 |
| 16 | 111111 |
| 17 | 142857 |
| 18 | 333333 |
| 19 | 999999 |
| 20 | 1111111 |
| 21 | 3333333 |
| 22 | 9999999 |
| 23 | 11111111 |
| 24 | 33333333 |
| 25 | 99999999 |
| 26 | 111111111 |