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 | 168 |
| 2 | 5616 |
| 3 | 60480 |
| 4 | 372000 |
| 5 | 5630688 |
| 6 | 16482816 |
| 7 | 42456960 |
| 8 | 212427600 |
| 9 | 810534816 |
| 10 | 4277145600 |
| 11 | 6950204928 |
| 12 | 16934047920 |
| 13 | 78156525216 |
| 14 | 152334000000 |
| 15 | 282027786768 |
| 16 | 499631102880 |
| 17 | 851974934400 |
| 18 | 1098404364288 |