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 | 2 |
| 3 | 12 |
| 4 | 4 |
| 5 | 30 |
| 6 | 6 |
| 7 | 5040 |
| 8 | 8 |
| 9 | 90 |
| 10 | 240240 |
| 11 | 360360 |
| 12 | 12 |
| 13 | 2346549004800 |
| 14 | 210 |
| 15 | 240 |
| 16 | 16 |
| 17 | 19275223968000 |
| 18 | 18 |
| 19 | 46113021921146019840000 |
| 20 | 420 |
| 21 | 214978908196382744494080000 |
| 22 | 10237090866494416404480000 |