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 | 12 |
| 4 | 60 |
| 5 | 2520 |
| 6 | 27720 |
| 7 | 720720 |
| 8 | 12252240 |
| 9 | 232792560 |
| 10 | 80313433200 |
| 11 | 2329089562800 |
| 12 | 144403552893600 |
| 13 | 5342931457063200 |
| 14 | 219060189739591200 |
| 15 | 9419588158802421600 |
| 16 | 3099044504245996706400 |
| 17 | 164249358725037825439200 |
| 18 | 9690712164777231700912800 |