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 | 1 |
| 3 | 2 |
| 4 | 2 |
| 5 | 12 |
| 6 | 24 |
| 7 | 216 |
| 8 | 192 |
| 9 | 720 |
| 10 | 3840 |
| 11 | 97200 |
| 12 | 69120 |
| 13 | 2721600 |
| 14 | 14515200 |
| 15 | 130636800 |
| 16 | 30965760 |
| 17 | 3810240000 |
| 18 | 3762339840 |
| 19 | 384072192000 |
| 20 | 445906944000 |
| 21 | 10184771520000 |
| 22 | 123605404876800 |
| 23 | 12674382336000000 |
| 24 | 2542739757465600 |