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 | 4 |
| 3 | 6 |
| 4 | 14 |
| 5 | 26 |
| 6 | 52 |
| 7 | 106 |
| 8 | 212 |
| 9 | 426 |
| 10 | 844 |
| 11 | 1706 |
| 12 | 1126 |
| 13 | 6826 |
| 14 | 13516 |
| 15 | 27306 |
| 16 | 54062 |
| 17 | 109226 |
| 18 | 216268 |
| 19 | 436906 |
| 20 | 288326 |
| 21 | 1747626 |
| 22 | 3460300 |
| 23 | 6990506 |
| 24 | 307548 |
| 25 | 27962026 |