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 | 8 |
| 2 | 168 |
| 3 | 5120 |
| 4 | 190120 |
| 5 | 7939008 |
| 6 | 357713664 |
| 7 | 17010543264 |
| 8 | 842994009000 |
| 9 | 43192225007360 |
| 10 | 2275378947981568 |
| 11 | 122724475613935104 |
| 12 | 6753785574641857024 |
| 13 | 378138077830110886400 |
| 14 | 21486835143540141873120 |
| 15 | 1236506847203439155401920 |
| 16 | 71934214120446285067176360 |