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 | 8 |
| 4 | 14 |
| 5 | 16 |
| 6 | 18 |
| 7 | 20 |
| 8 | 26 |
| 9 | 30 |
| 10 | 42 |
| 11 | 108 |
| 12 | 132 |
| 13 | 234 |
| 14 | 264 |
| 15 | 288 |
| 16 | 354 |
| 17 | 504 |
| 18 | 1920 |
| 19 | 2010 |
| 20 | 5040 |