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 | 12 |
| 4 | 336 |
| 5 | 360 |
| 6 | 45696 |
| 7 | 52416 |
| 8 | 75600 |
| 9 | 22665216 |
| 10 | 31804416 |
| 11 | 42928704 |
| 12 | 77792400 |
| 13 | 92610000 |
| 14 | 164656800 |
| 15 | 174636000 |