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 | 196560 |
| 2 | 52416000 |
| 3 | 6218175600 |
| 4 | 565866362880 |
| 5 | 45792819072000 |
| 6 | 3486157968384000 |
| 7 | 256206274225902000 |
| 8 | 18422726047165440000 |
| 9 | 1305984407917646096640 |
| 10 | 91692325887531393024000 |