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) |
|---|---|
| 10 | 1 |
| 11 | 22 |
| 12 | 264 |
| 13 | 2288 |
| 14 | 16016 |
| 15 | 96096 |
| 16 | 512512 |
| 17 | 2489344 |
| 18 | 11202048 |
| 19 | 47297536 |
| 20 | 189190144 |
| 21 | 722362368 |
| 22 | 2648662016 |
| 23 | 9372188672 |
| 24 | 32133218304 |
| 25 | 107110727680 |
| 26 | 348109864960 |
| 27 | 1105760747520 |
| 28 | 3440144547840 |
| 29 | 10501493882880 |
| 30 | 31504481648640 |