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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 4 |
| 4 | 48 |
| 5 | 16 |
| 6 | 576 |
| 7 | 576 |
| 8 | 11520 |
| 9 | 768 |
| 10 | 9216 |
| 11 | 3072 |
| 12 | 3870720 |
| 13 | 552960 |
| 14 | 442368 |
| 15 | 442368 |
| 16 | 26542080 |
| 17 | 8847360 |
| 18 | 2229534720 |
| 19 | 445906944 |
| 20 | 70071091200 |
| 21 | 6370099200 |
| 22 | 76441190400 |
| 23 | 25480396800 |
| 24 | 83473779916800 |
| 25 | 1284211998720 |
| 26 | 5136847994880 |
| 27 | 81537269760 |
| 28 | 4892236185600 |