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) |
|---|---|
| 3 | 5 |
| 4 | 23 |
| 5 | 59 |
| 6 | 719 |
| 7 | 5039 |
| 8 | 6719 |
| 9 | 181439 |
| 10 | 5039 |
| 11 | 6652799 |
| 12 | 479001599 |
| 13 | 154439 |
| 14 | 87178291199 |
| 15 | 54486431999 |
| 16 | 3487131647999 |
| 17 | 59281238015999 |
| 18 | 1067062284287999 |
| 19 | 1013709170073599 |
| 20 | 405483668029439999 |
| 21 | 39070079 |
| 22 | 180503769599 |