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) |
|---|---|
| 1 | 3 |
| 2 | 40 |
| 3 | 1008 |
| 4 | 5702400 |
| 5 | 566092800 |
| 6 | 27360571392000 |
| 7 | 7155594141696000 |
| 8 | 1360632459941314560000 |
| 9 | 384424434510421824110592000000 |
| 10 | 283546160488893890266398720000000 |