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 | 7 |
| 3 | 72 |
| 4 | 600 |
| 5 | 4032 |
| 6 | 24576 |
| 7 | 138240 |
| 8 | 743424 |
| 9 | 3833856 |
| 10 | 19267584 |
| 11 | 94371840 |
| 12 | 454557696 |