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 | 6 |
| 4 | 24 |
| 5 | 28 |
| 6 | 120 |
| 7 | 496 |
| 8 | 672 |
| 9 | 4320 |
| 10 | 4680 |
| 11 | 8128 |
| 12 | 26208 |
| 13 | 30240 |
| 14 | 32760 |
| 15 | 523776 |
| 16 | 2178540 |
| 17 | 8910720 |
| 18 | 17428320 |
| 19 | 20427264 |
| 20 | 23569920 |
| 21 | 33550336 |
| 22 | 45532800 |
| 23 | 91963648 |
| 24 | 142990848 |
| 25 | 197064960 |
| 26 | 459818240 |
| 27 | 1379454720 |
| 28 | 1476304896 |
| 29 | 8583644160 |
| 30 | 8589869056 |
| 31 | 10200236032 |