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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 3 |
| 5 | 30 |
| 6 | 405 |
| 7 | 10080 |
| 8 | 369180 |
| 9 | 17959158 |
| 10 | 1092909510 |
| 11 | 81043601760 |
| 12 | 7195434965235 |
| 13 | 753877707936210 |
| 14 | 92048844661576803 |
| 15 | 12957249486666966390 |
| 16 | 2083048648390795634640 |
| 17 | 379312444955136162744540 |