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 | 7 |
| 2 | 72 |
| 3 | 990 |
| 4 | 17160 |
| 5 | 360360 |
| 6 | 8910720 |
| 7 | 253955520 |
| 8 | 8204716800 |
| 9 | 296541907200 |
| 10 | 11861676288000 |
| 11 | 520431047136000 |
| 12 | 24858235898496000 |
| 13 | 1284342188088960000 |
| 14 | 71382386874839040000 |
| 15 | 4247252019052922880000 |