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 | 1 |
| 2 | 24 |
| 3 | 3240 |
| 4 | 1290240 |
| 5 | 1126125000 |
| 6 | 1822853652480 |
| 7 | 4914543582748800 |
| 8 | 20469829379869900800 |
| 9 | 124583146969045247683200 |
| 10 | 1061374990515840000000000000 |
| 11 | 12232437772393129356474535526400 |