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 | 420 |
| 2 | 55440 |
| 3 | 2042040 |
| 4 | 23931600 |
| 5 | 75698280 |
| 6 | 142334216640 |
| 7 | 1877686881840 |
| 8 | 185643608470320 |
| 9 | 2137147184560080 |