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 | 0 |
| 2 | 2 |
| 3 | 4 |
| 4 | 6 |
| 5 | 12 |
| 6 | 18 |
| 7 | 24 |
| 8 | 42 |
| 9 | 84 |
| 10 | 300 |
| 11 | 390 |
| 12 | 780 |
| 13 | 822 |
| 14 | 2430 |
| 15 | 5508 |
| 16 | 5514 |
| 17 | 6492 |
| 18 | 12372 |
| 19 | 22680 |
| 20 | 25770 |
| 21 | 169416 |
| 22 | 174240 |
| 23 | 383544 |
| 24 | 1007838 |
| 25 | 1572882 |