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 | 28 |
| 3 | 1638 |
| 4 | 30240 |
| 5 | 2178540 |
| 6 | 2457000 |
| 7 | 32997888 |
| 8 | 142990848 |
| 9 | 1307124000 |
| 10 | 71271827200 |
| 11 | 547929930240 |
| 12 | 2198278051200 |
| 13 | 2567400675840 |
| 14 | 54409216942080 |