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 | 168 |
| 3 | 5616 |
| 4 | 43008 |
| 5 | 372000 |
| 6 | 943488 |
| 7 | 5630688 |
| 8 | 11010048 |
| 9 | 36846576 |
| 10 | 62496000 |
| 11 | 212427600 |
| 12 | 241532928 |
| 13 | 810534816 |
| 14 | 945955584 |
| 15 | 2089152000 |
| 16 | 2818572288 |
| 17 | 6950204928 |
| 18 | 6190224768 |
| 19 | 16934047920 |
| 20 | 15998976000 |
| 21 | 31621943808 |
| 22 | 35687836800 |