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 | 1 |
| 1 | 2 |
| 2 | 24 |
| 3 | 864 |
| 4 | 69120 |
| 5 | 10368000 |
| 6 | 2612736000 |
| 7 | 1024192512000 |
| 8 | 589934886912000 |
| 9 | 477847258398720000 |
| 10 | 525631984238592000000 |
| 11 | 763217641114435584000000 |
| 12 | 1428743424166223413248000000 |
| 13 | 3380406941577284595744768000000 |