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 | 22 |
| 3 | 1350 |
| 4 | 162456 |
| 5 | 32319000 |
| 6 | 9604465200 |
| 7 | 3986353491120 |
| 8 | 2202727143576960 |
| 9 | 1563325251963995520 |
| 10 | 1385918755006365216000 |
| 11 | 1500893038955163069216000 |
| 12 | 1949720475921117012670233600 |
| 13 | 2992360962617823634351113600000 |
| 14 | 5356716752093284789859604692736000 |