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 | 1 |
| 3 | 3 |
| 4 | 13 |
| 5 | 829 |
| 6 | 78441 |
| 7 | 622316671 |
| 8 | 3001764349333 |
| 9 | 5926347237626029593 |
| 10 | 2616519370820267981798929 |