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) |
|---|---|
| 2 | 19 |
| 3 | 829 |
| 4 | 9439 |
| 5 | 99139 |
| 6 | 983449 |
| 7 | 9973219 |
| 8 | 99982249 |
| 9 | 999986179 |
| 10 | 9999857299 |
| 11 | 99999895609 |
| 12 | 999999843259 |
| 13 | 9999999990529 |
| 14 | 99999999950449 |
| 15 | 999999999984529 |
| 16 | 9999999999854539 |
| 17 | 99999999998034559 |
| 18 | 999999999999371719 |