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) |
|---|---|
| 0 | 1 |
| 1 | 48 |
| 2 | 756 |
| 3 | 6720 |
| 4 | 41580 |
| 5 | 199584 |
| 6 | 792792 |
| 7 | 2718144 |
| 8 | 8281845 |
| 9 | 22902880 |
| 10 | 58402344 |
| 11 | 139007232 |
| 12 | 311800944 |
| 13 | 664191360 |
| 14 | 1352103840 |
| 15 | 2644114176 |
| 16 | 4988699793 |
| 17 | 9114302736 |
| 18 | 16175074300 |
| 19 | 27959131200 |
| 20 | 47181033900 |
| 21 | 77886151200 |
| 22 | 126001769400 |
| 23 | 200078424000 |
| 24 | 312275179125 |