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 | 120 |
| 3 | 1920 |
| 4 | 16320 |
| 5 | 32640 |
| 6 | 261120 |
| 7 | 1044480 |
| 8 | 8355840 |
| 9 | 26732160 |
| 10 | 67107840 |
| 11 | 253955520 |
| 12 | 268431360 |
| 13 | 507911040 |
| 14 | 2147450880 |
| 15 | 4063288320 |
| 16 | 9396354240 |