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 | 2 |
| 2 | 12 |
| 3 | 216 |
| 4 | 8640 |
| 5 | 933120 |
| 6 | 209018880 |
| 7 | 100329062400 |
| 8 | 130026464870400 |
| 9 | 349511137571635200 |
| 10 | 1968446726803449446400 |
| 11 | 22676506292775737622528000 |
| 12 | 522466704985552994823045120000 |
| 13 | 27820307107070725868337506549760000 |