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) |
|---|---|
| 2 | 6 |
| 3 | 336 |
| 4 | 3795 |
| 5 | 23520 |
| 6 | 102795 |
| 7 | 355656 |
| 8 | 1039626 |
| 9 | 2674440 |
| 10 | 6223140 |
| 11 | 13354440 |
| 12 | 26807781 |
| 13 | 50885016 |
| 14 | 92095185 |
| 15 | 159981360 |
| 16 | 268161060 |
| 17 | 435614256 |
| 18 | 688255506 |
| 19 | 1060829280 |
| 20 | 1599170055 |
| 21 | 2362871280 |
| 22 | 3428409831 |
| 23 | 4892775096 |
| 24 | 6877654350 |