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 | 0 |
| 1 | 1 |
| 2 | 24 |
| 3 | 1080 |
| 4 | 78400 |
| 5 | 8415000 |
| 6 | 1254839040 |
| 7 | 248351295808 |
| 8 | 63008824320000 |
| 9 | 19941885512640000 |
| 10 | 7702879929184000000 |
| 11 | 3566623957287040742400 |
| 12 | 1950112829958404302503936 |
| 13 | 1243182598706645953527808000 |
| 14 | 913988528405739663528960000000 |