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 | 2520 |
| 3 | 635040 |
| 4 | 1015560 |
| 5 | 10119126106147652568 |
| 6 | 11158922880 |
| 7 | 5918858243794044864 |
| 8 | 1046458990080 |