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 | 1 |
| 1 | 12 |
| 2 | 160 |
| 3 | 40320 |
| 4 | 71680 |
| 5 | 1277337600 |
| 6 | 79705866240 |
| 7 | 167382319104000 |
| 8 | 91055981592576000 |
| 9 | 62282291409321984000 |
| 10 | 4024394214140805120000 |
| 11 | 5882770031248492462080000 |
| 12 | 9076273762497674084352000000 |