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 | 2 |
| 3 | 8 |
| 4 | 96 |
| 5 | 1248 |
| 6 | 12000 |
| 7 | 259200 |
| 8 | 5461344 |
| 9 | 129140160 |
| 10 | 2725643520 |
| 11 | 127561104000 |
| 12 | 2743415522496 |
| 13 | 139778722137600 |
| 14 | 2504616361228800 |
| 15 | 111747349423990784 |
| 16 | 8644660582219776000 |
| 17 | 387774574486565683200 |
| 18 | 12306643656809728412160 |
| 19 | 816897235219321957908480 |