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 | 1 |
| 3 | 2 |
| 4 | 6 |
| 5 | 24 |
| 6 | 120 |
| 7 | 1680 |
| 8 | 27720 |
| 9 | 720720 |
| 10 | 122522400 |
| 11 | 41902660800 |
| 12 | 130429015516800 |
| 13 | 3066842656354276800 |
| 14 | 1970992304700453905270400 |
| 15 | 168721307030313765796546413936000 |
| 16 | 1897544233056092162003806758651798777216000 |
| 17 | 8201519488959040182625924708238885435575055666675808000 |