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 | 1 |
| 2 | 1 |
| 3 | 4 |
| 4 | 268 |
| 5 | 9456 |
| 6 | 301306 |
| 7 | 24846368 |
| 8 | 8946957244 |
| 9 | 4175660906560 |
| 10 | 2421067614753916 |