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 | 5 |
| 3 | 125 |
| 4 | 3120 |
| 5 | 77875 |
| 6 | 1943755 |
| 7 | 48516000 |
| 8 | 1210956245 |
| 9 | 30225390125 |
| 10 | 754423796880 |
| 11 | 18830369531875 |
| 12 | 470004814499995 |
| 13 | 11731289992968000 |
| 14 | 292812245009700005 |
| 15 | 7308574835249532125 |
| 16 | 182421558636228603120 |