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 | 16 |
| 3 | 96 |
| 4 | 448 |
| 5 | 1858 |
| 6 | 6896 |
| 7 | 23776 |
| 8 | 76608 |
| 9 | 234432 |
| 10 | 684336 |
| 11 | 1921472 |
| 12 | 5206208 |
| 13 | 13679490 |
| 14 | 34941120 |
| 15 | 87036576 |
| 16 | 211822976 |
| 17 | 504784704 |
| 18 | 1179589728 |
| 19 | 2707337056 |
| 20 | 6109982400 |
| 21 | 13575320320 |
| 22 | 29721857904 |
| 23 | 64184237216 |
| 24 | 136816242816 |