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 | 1 |
| 2 | 12 |
| 3 | 8640 |
| 4 | 870912000 |
| 5 | 22122558259200000 |
| 6 | 222531556847250309120000000 |
| 7 | 1280394777025250130271722799104000000000 |
| 8 | 5746332926632566442385615219551212618645504000000000000 |