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 | 3 |
| 2 | 7 |
| 3 | 29 |
| 4 | 139 |
| 5 | 821 |
| 6 | 5659 |
| 7 | 44741 |
| 8 | 515616581 |
| 9 | 1389068025019 |
| 10 | 2390389721955353653838200398484730341485707553165512827613149996957838364422981 |