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 | 3 |
| 3 | 7 |
| 4 | 19 |
| 5 | 71 |
| 6 | 431 |
| 7 | 1259 |
| 8 | 4679 |
| 9 | 9719 |
| 10 | 23399 |
| 11 | 7559 |
| 12 | 42839 |
| 13 | 134399 |
| 14 | 181439 |
| 15 | 477359 |
| 16 | 241919 |
| 17 | 262079 |
| 18 | 453599 |