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 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 12 |
| 5 | 20 |
| 6 | 30 |
| 7 | 210 |
| 8 | 336 |
| 9 | 504 |
| 10 | 5040 |
| 11 | 7920 |
| 12 | 11880 |
| 13 | 154440 |
| 14 | 240240 |
| 15 | 360360 |
| 16 | 5765760 |
| 17 | 8910720 |
| 18 | 13366080 |
| 19 | 253955520 |
| 20 | 390700800 |
| 21 | 586051200 |
| 22 | 12893126400 |
| 23 | 19769460480 |
| 24 | 29654190720 |
| 25 | 741354768000 |
| 26 | 1133836704000 |
| 27 | 1700755056000 |
| 28 | 47621141568000 |
| 29 | 72684900288000 |