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 | 2 |
| 2 | 6 |
| 3 | 12 |
| 4 | 30 |
| 5 | 72 |
| 6 | 90 |
| 7 | 210 |
| 8 | 240 |
| 9 | 420 |
| 10 | 600 |
| 11 | 1260 |
| 12 | 6480 |
| 13 | 15750 |
| 14 | 50400 |
| 15 | 147840 |
| 16 | 194040 |
| 17 | 291060 |
| 18 | 510510 |
| 19 | 2942940 |
| 20 | 4324320 |
| 21 | 5762400 |
| 22 | 9147600 |
| 23 | 19136250 |
| 24 | 96049800 |
| 25 | 153153000 |
| 26 | 15178363200 |
| 27 | 37822664880 |
| 28 | 401392571580 |