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 | 12 |
| 4 | 60 |
| 5 | 120 |
| 6 | 360 |
| 7 | 2520 |
| 8 | 5040 |
| 9 | 55440 |
| 10 | 720720 |
| 11 | 1441440 |
| 12 | 4324320 |
| 13 | 21621600 |
| 14 | 367567200 |
| 15 | 6983776800 |
| 16 | 321253732800 |
| 17 | 6064949221531200 |
| 18 | 791245405339403414400 |
| 19 | 37188534050951960476800 |
| 20 | 581442729886633902054768000 |