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 | 24 |
| 2 | 636 |
| 3 | 26304 |
| 4 | 1650456 |
| 5 | 147705984 |
| 6 | 17913816576 |
| 7 | 2830553662464 |
| 8 | 565108879101696 |
| 9 | 139114514096953344 |
| 10 | 41397845529582959616 |
| 11 | 14649251145209922945024 |
| 12 | 6079754611331559564097536 |