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 | 0 |
| 1 | 16 |
| 2 | 576 |
| 3 | 25600 |
| 4 | 1254400 |
| 5 | 65028096 |
| 6 | 3497066496 |
| 7 | 192980975616 |
| 8 | 10855179878400 |
| 9 | 619683355033600 |
| 10 | 35792910586740736 |
| 11 | 2087229562810269696 |
| 12 | 122682715414070296576 |
| 13 | 7259332273021911040000 |
| 14 | 432004345063916175360000 |
| 15 | 25835779854133582469529600 |