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 | 1 |
| 4 | 2 |
| 5 | 2 |
| 6 | 3 |
| 7 | 6 |
| 8 | 8 |
| 9 | 12 |
| 10 | 24 |
| 11 | 40 |
| 12 | 60 |
| 13 | 120 |
| 14 | 240 |
| 15 | 360 |
| 16 | 720 |
| 17 | 1680 |
| 18 | 2520 |
| 19 | 5040 |
| 20 | 13440 |
| 21 | 20160 |
| 22 | 40320 |
| 23 | 120960 |
| 24 | 181440 |
| 25 | 362880 |
| 26 | 1209600 |
| 27 | 1814400 |
| 28 | 3628800 |