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 | 191 |
| 5 | 25983 |
| 6 | 2663063519 |
| 7 | 7160414743310596607 |
| 8 | 208229791652776621349215306687873023871 |
| 9 | 45218742589363955614633859184750699518167124046103786511727246869388335095775 |