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 | 2 |
| 2 | 6 |
| 3 | 120 |
| 4 | 210 |
| 5 | 360360 |
| 6 | 6983776800 |
| 7 | 9777287520 |
| 8 | 13967553600 |
| 9 | 48886437600 |
| 10 | 195545750400 |
| 11 | 293318625600 |
| 12 | 148419224553600 |
| 13 | 296838449107200 |
| 14 | 868252463638560000 |
| 15 | 4002866486210592000 |
| 16 | 8005732972421184000 |
| 17 | 68048730265580064000 |
| 18 | 136097460531160128000 |
| 19 | 4082923815934803840000 |