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 | 11 |
| 2 | 12 |
| 3 | 21 |
| 4 | 111 |
| 5 | 979 |
| 6 | 19521 |
| 7 | 279259 |
| 8 | 4841411 |
| 9 | 7231219 |
| 10 | 10238379 |
| 11 | 14645479 |
| 12 | 136531171 |
| 13 | 592994139 |
| 14 | 1869506239 |
| 15 | 13820158011 |
| 16 | 35242846899 |
| 17 | 211443753471 |
| 18 | 330984643659 |
| 19 | 8806335754299 |