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 | 5 |
| 3 | 55 |
| 4 | 22434 |
| 5 | 75381849525 |
| 6 | 1560152215306022835807766096 |
| 7 | 96142947030750035305397690793504947854390697291777107758182668001398 |