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 | 6 |
| 2 | 2850 |
| 3 | 79800 |
| 4 | 2162160 |
| 5 | 134734320 |
| 6 | 15518903400 |
| 7 | 174626020800 |
| 8 | 19794628854000 |
| 9 | 659394533191680 |
| 10 | 659394533191680 |
| 11 | 659394533191680 |
| 12 | 38022361747469489295360 |