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) |
|---|---|
| 3 | 6 |
| 4 | 72 |
| 5 | 690 |
| 6 | 6192 |
| 7 | 53946 |
| 8 | 466800 |
| 9 | 4053816 |
| 10 | 35450940 |
| 11 | 312411672 |
| 12 | 2773863060 |
| 13 | 24802293720 |
| 14 | 223203954264 |
| 15 | 2020552369164 |