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) |
|---|---|
| 2 | 1089 |
| 3 | 2178 |
| 4 | 21978 |
| 5 | 24024 |
| 6 | 2426424 |
| 7 | 240264024 |
| 8 | 23162643504 |
| 9 | 2305213214304 |