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 | 2 |
| 3 | 10 |
| 4 | 630 |
| 5 | 2520 |
| 6 | 277200 |
| 7 | 97297200 |
| 8 | 3405402000 |
| 9 | 463134672000 |
| 10 | 475176173472000 |
| 11 | 16631166071520000 |
| 12 | 4207685016094560000 |
| 13 | 3786916514485104000000 |
| 14 | 98459829376612704000000 |