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 | 3 |
| 1 | 2 |
| 2 | 31 |
| 3 | 2309 |
| 4 | 8191 |
| 5 | 746129 |
| 6 | 16546531 |
| 7 | 300690389 |
| 8 | 11823922111 |
| 9 | 239378649509 |
| 10 | 11003163441269 |
| 11 | 304250263527209 |
| 12 | 23293697005168589 |