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 | 2 |
| 3 | 6 |
| 4 | 8 |
| 5 | 40 |
| 6 | 48 |
| 7 | 336 |
| 8 | 128 |
| 9 | 864 |
| 10 | 1280 |
| 11 | 8448 |
| 12 | 3072 |
| 13 | 39936 |