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 | 24 |
| 5 | 720 |
| 6 | 5040 |
| 7 | 39916800 |
| 8 | 479001600 |
| 9 | 87178291200 |
| 10 | 10888869450418352160768000000 |
| 11 | 265252859812191058636308480000000 |
| 12 | 263130836933693530167218012160000000 |