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) |
|---|---|
| 2 | 1 |
| 3 | 4 |
| 4 | 31 |
| 5 | 360 |
| 6 | 5625 |
| 7 | 110880 |
| 8 | 2643795 |
| 9 | 74035080 |
| 10 | 2382538725 |
| 11 | 86656878000 |
| 12 | 3515761193175 |
| 13 | 157425426358200 |
| 14 | 7711961781949425 |
| 15 | 410298436511964000 |
| 16 | 23559634669682986875 |
| 17 | 1452240056377167057000 |
| 18 | 95649328231839993736125 |