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 | 6 |
| 3 | 84 |
| 4 | 2312 |
| 5 | 121056 |
| 6 | 12173568 |
| 7 | 2391143424 |
| 8 | 928316362752 |
| 9 | 716762538541056 |
| 10 | 1103851068987015168 |
| 11 | 3395472896229407981568 |
| 12 | 20875407961847891162038272 |
| 13 | 256600638160251032545689337856 |
| 14 | 6307244441266548036155317187248128 |