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 | 7200 |
| 4 | 168506880 |
| 5 | 112603286160 |
| 6 | 15108392957760 |
| 7 | 775405390866960 |
| 8 | 20886647215714560 |
| 9 | 353998543659193440 |
| 10 | 4231366997071432320 |
| 11 | 38508081275604409920 |
| 12 | 281586666065022616320 |
| 13 | 1720887594454493527920 |
| 14 | 9053942417801770507200 |
| 15 | 41955877772610102690480 |