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 | 16 |
| 2 | 784 |
| 3 | 48400 |
| 4 | 3312400 |
| 5 | 240374016 |
| 6 | 18116083216 |
| 7 | 1401950721600 |
| 8 | 110634634890000 |
| 9 | 8862957169158400 |
| 10 | 718528370729238784 |
| 11 | 58818762721626513424 |
| 12 | 4853704694918904043024 |
| 13 | 403242220875862752160000 |
| 14 | 33694913171561404510440000 |
| 15 | 2829611125043050701300998400 |