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 | 4 |
| 4 | 6 |
| 5 | 8 |
| 6 | 16 |
| 7 | 30 |
| 8 | 36 |
| 9 | 40 |
| 10 | 72 |
| 11 | 210 |
| 12 | 240 |
| 13 | 252 |
| 14 | 256 |
| 15 | 2310 |
| 16 | 2520 |
| 17 | 2560 |
| 18 | 2592 |
| 19 | 2808 |
| 20 | 5184 |
| 21 | 30030 |
| 22 | 32832 |
| 23 | 510510 |
| 24 | 573300 |
| 25 | 9699690 |
| 26 | 223092870 |
| 27 | 232792560 |