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 | 120 |
| 2 | 672 |
| 3 | 4320 |
| 4 | 4680 |
| 5 | 26208 |
| 6 | 523776 |
| 7 | 20427264 |
| 8 | 29795040 |
| 9 | 34369920 |
| 10 | 96445440 |
| 11 | 197064960 |
| 12 | 459818240 |
| 13 | 557107200 |