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 | 1 |
| 2 | 60 |
| 3 | 336 |
| 4 | 21600 |
| 5 | 133056 |
| 6 | 825552000 |
| 7 | 89100 |
| 8 | 11435424000 |
| 9 | 483113030400 |
| 10 | 101889627840000 |
| 11 | 1471926193920 |
| 12 | 42280119968486400 |
| 13 | 3425059028160 |
| 14 | 209827678712652000 |
| 15 | 1184296360402995840 |
| 16 | 163066081742403840000 |
| 17 | 1749151741873536000 |
| 18 | 20373357051590182072392960000 |