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 | 19 |
| 3 | 419 |
| 4 | 5419 |
| 5 | 35419 |
| 6 | 735419 |
| 7 | 12735419 |
| 8 | 1112735419 |
| 9 | 131112735419 |
| 10 | 42131112735419 |
| 11 | 2642131112735419 |
| 12 | 102642131112735419 |
| 13 | 17102642131112735419 |
| 14 | 1617102642131112735419 |
| 15 | 201617102642131112735419 |