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 | 120 |
| 2 | 672 |
| 3 | 32760 |
| 4 | 2178540 |
| 5 | 1379454720 |
| 6 | 14182439040 |
| 7 | 518666803200 |
| 8 | 30823866178560 |
| 9 | 71065075104190073088 |
| 10 | 154345556085770649600 |
| 11 | 9186050031556349952000 |
| 12 | 680489641226538823680000 |