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 | 10 |
| 3 | 190 |
| 4 | 5320 |
| 5 | 196840 |
| 6 | 9054640 |
| 7 | 498005200 |
| 8 | 31872332800 |
| 9 | 2326680294400 |
| 10 | 190787784140800 |
| 11 | 17361688356812800 |
| 12 | 1736168835681280000 |
| 13 | 189242403089259520000 |
| 14 | 22330603564532623360000 |