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) |
|---|---|
| 0 | 4 |
| 1 | 24 |
| 2 | 432 |
| 3 | 10512 |
| 4 | 290552 |
| 5 | 8800432 |
| 6 | 284289160 |
| 7 | 9621738448 |