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 | 6 |
| 3 | 24 |
| 4 | 28 |
| 5 | 496 |
| 6 | 2016 |
| 7 | 8128 |
| 8 | 8190 |
| 9 | 42336 |
| 10 | 45864 |
| 11 | 392448 |
| 12 | 714240 |
| 13 | 1571328 |
| 14 | 33550336 |
| 15 | 61900800 |
| 16 | 91963648 |
| 17 | 211891200 |
| 18 | 1931236608 |
| 19 | 2013143040 |
| 20 | 4428914688 |
| 21 | 8589869056 |
| 22 | 10200236032 |
| 23 | 137438691328 |
| 24 | 214204956672 |