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 | 48 |
| 3 | 3721 |
| 4 | 1143000 |
| 5 | 1608491236 |
| 6 | 10563801093680 |
| 7 | 324302970384650401 |
| 8 | 44925988058251637085336 |