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 | 0 |
| 2 | 18 |
| 3 | 36 |
| 4 | 720 |
| 5 | 3600 |
| 6 | 42624 |
| 7 | 312480 |
| 8 | 3148032 |
| 9 | 27073152 |
| 10 | 261446688 |
| 11 | 2407791936 |
| 12 | 23168736768 |
| 13 | 220481838720 |
| 14 | 2137258661472 |