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) |
|---|---|
| 1 | 0 |
| 2 | 4 |
| 3 | 12 |
| 4 | 96 |
| 5 | 1120 |
| 6 | 17280 |
| 7 | 330624 |
| 8 | 7540736 |
| 9 | 199544832 |
| 10 | 6006988800 |
| 11 | 202646118400 |
| 12 | 7570772656128 |
| 13 | 310240496517120 |
| 14 | 13834761553313792 |
| 15 | 666909048381112320 |
| 16 | 34555424387503226880 |
| 17 | 1915099718255940468736 |