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 | 1 |
| 2 | 3 |
| 3 | 7 |
| 4 | 19 |
| 5 | 67 |
| 6 | 307 |
| 7 | 1747 |
| 8 | 11827 |
| 9 | 92467 |
| 10 | 818227 |
| 11 | 8075827 |
| 12 | 87909427 |
| 13 | 1045912627 |
| 14 | 13499954227 |
| 15 | 187856536627 |
| 16 | 2803205272627 |
| 17 | 44648785048627 |
| 18 | 756023641240627 |
| 19 | 13560771052696627 |
| 20 | 256850971870360627 |
| 21 | 5122654988223640627 |