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 | 2 |
| 2 | 13 |
| 3 | 149 |
| 4 | 1237 |
| 5 | 13789 |
| 6 | 123479 |
| 7 | 1235789 |
| 8 | 12345679 |
| 9 | 102345679 |
| 10 | 1123456789 |
| 11 | 10123456789 |
| 12 | 1011233456789 |
| 13 | 1012334567789 |
| 14 | 10123345677899 |