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 | 4 |
| 2 | 96 |
| 3 | 18432 |
| 4 | 31850496 |
| 5 | 550376570880 |
| 6 | 114126085737676800 |
| 7 | 331312591939905257472000 |
| 8 | 14427205603578338379772723200000 |
| 9 | 10051861189298894268003697526046720000000 |