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 | 4 |
| 2 | 13 |
| 3 | 287 |
| 4 | 294 |
| 5 | 6564 |
| 6 | 90163 |
| 7 | 1136828 |
| 8 | 3301262 |
| 9 | 276404649 |
| 10 | 5643189146 |