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 | 3 |
| 3 | 60 |
| 4 | 728 |
| 5 | 10416 |
| 6 | 116064 |
| 7 | 2837120 |
| 8 | 36990720 |
| 9 | 1452853584 |
| 10 | 27615698352 |
| 11 | 965243666880 |
| 12 | 23861701899840 |
| 13 | 1355882884941312 |
| 14 | 20758574413420992 |
| 15 | 1604569397488307712 |
| 16 | 93340493714183159808 |
| 17 | 3135286584767445151680 |
| 18 | 90560273718863022770592 |
| 19 | 8284620870197084160000000 |