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) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 8 |
| 4 | 84 |
| 5 | 800 |
| 6 | 15360 |
| 7 | 357696 |
| 8 | 6873984 |
| 9 | 262813248 |
| 10 | 12288817152 |
| 11 | 432621305856 |
| 12 | 28148895055872 |
| 13 | 2108257586380800 |