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 | 9 |
| 3 | 52 |
| 4 | 463 |
| 5 | 5371 |
| 6 | 77320 |
| 7 | 1231170 |
| 8 | 20115063 |
| 9 | 319006954 |
| 10 | 4768598707 |
| 11 | 66353854322 |
| 12 | 856330630443 |
| 13 | 10262183989448 |