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 | 6 |
| 3 | 40320 |
| 4 | 1307674368000 |
| 5 | 620448401733239439360000 |
| 6 | 10333147966386144929666651337523200000000 |
| 7 | 12413915592536072670862289047373375038521486354677760000000000 |