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) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 72 |
| 3 | 1080 |
| 4 | 18144 |
| 5 | 326592 |
| 6 | 6158592 |
| 7 | 120092544 |
| 8 | 2401850880 |
| 9 | 48997757952 |
| 10 | 1015589892096 |
| 11 | 21327387734016 |
| 12 | 452796847276032 |
| 13 | 9702789584486400 |
| 14 | 209580255024906240 |
| 15 | 4558370546791710720 |
| 16 | 99747873141559787520 |
| 17 | 2194453209114315325440 |
| 18 | 48508965675158549299200 |