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 | 1 |
| 2 | 19 |
| 3 | 400 |
| 4 | 8379 |
| 5 | 175561 |
| 6 | 3678400 |
| 7 | 77070841 |
| 8 | 1614809259 |
| 9 | 33833923600 |
| 10 | 708897586339 |
| 11 | 14853015389521 |
| 12 | 311204425593600 |
| 13 | 6520439922076081 |
| 14 | 136618033938004099 |
| 15 | 2862458272776010000 |
| 16 | 59975005694358205899 |