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 | 128 |
| 4 | 4992 |
| 5 | 241664 |
| 6 | 14131200 |
| 7 | 972521472 |
| 8 | 77138231296 |
| 9 | 6935178903552 |
| 10 | 697359579217920 |
| 11 | 77576992194560000 |
| 12 | 9461629052252061696 |
| 13 | 1255632936007234486272 |
| 14 | 180144800985155488448512 |
| 15 | 27786422394606966747955200 |
| 16 | 4585649599904345055716966400 |
| 17 | 806288164205933489807717040128 |