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 | 0 |
| 2 | 0 |
| 3 | 3 |
| 4 | 16 |
| 5 | 5 |
| 6 | 576 |
| 7 | 2023 |
| 8 | 4096 |
| 9 | 227529 |
| 10 | 2656000 |
| 11 | 26301011 |
| 12 | 443667456 |
| 13 | 5268921853 |
| 14 | 294332416 |
| 15 | 820814907375 |
| 16 | 19909425135616 |
| 17 | 225992064764177 |
| 18 | 5838869363687424 |
| 19 | 43054524724611979 |
| 20 | 296380418621440000 |