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 | 2 |
| 2 | 24 |
| 3 | 320 |
| 4 | 11264 |
| 5 | 688128 |
| 6 | 90177536 |
| 7 | 22817013760 |
| 8 | 11751030521856 |
| 9 | 11997870882291712 |
| 10 | 24607668363952390144 |
| 11 | 100719222642454151823360 |
| 12 | 825394103341888069030641664 |
| 13 | 13520781109074923362448234774528 |