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 | 72 |
| 2 | 420 |
| 3 | 30240 |
| 4 | 360360 |
| 5 | 12252240 |
| 6 | 24504480 |
| 7 | 64864800 |
| 8 | 232792560 |
| 9 | 1163962800 |
| 10 | 1470268800 |
| 11 | 2572970400 |
| 12 | 5354228880 |
| 13 | 26771144400 |
| 14 | 32125373280 |
| 15 | 53542288800 |
| 16 | 83805321600 |
| 17 | 107084577600 |
| 18 | 2329089562800 |
| 19 | 4658179125600 |
| 20 | 13974537376800 |