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 | 0 |
| 2 | 1 |
| 3 | 11 |
| 4 | 111 |
| 5 | 112 |
| 6 | 123 |
| 7 | 1111 |
| 8 | 1213 |
| 9 | 1267 |
| 10 | 1478 |
| 11 | 7283 |
| 12 | 7328 |
| 13 | 11111 |
| 14 | 76548 |
| 15 | 105672 |
| 16 | 105836 |
| 17 | 111111 |
| 18 | 1111111 |
| 19 | 11111111 |
| 20 | 911111111 |
| 21 | 9911111111 |