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) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 85 |
| 3 | 1351 |
| 4 | 23281 |
| 5 | 422527 |
| 6 | 7951069 |
| 7 | 153458935 |
| 8 | 3018043777 |
| 9 | 60225528727 |
| 10 | 1215821974885 |
| 11 | 24777776573095 |
| 12 | 508935634491025 |
| 13 | 10522995625652335 |
| 14 | 218814097786515085 |
| 15 | 4572338217781407031 |
| 16 | 95953172529722919937 |
| 17 | 2021236451413828339495 |
| 18 | 42719661851354642952181 |