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 | 2 |
| 3 | 7 |
| 4 | 7 |
| 5 | 25 |
| 6 | 25 |
| 7 | 83 |
| 8 | 83 |
| 9 | 243 |
| 10 | 243 |
| 11 | 1038 |
| 12 | 1038 |
| 13 | 4205 |
| 14 | 4205 |
| 15 | 17724 |
| 16 | 17724 |
| 17 | 78553 |
| 18 | 78553 |
| 19 | 349246 |
| 20 | 349246 |
| 21 | 1526658 |
| 22 | 1526658 |
| 23 | 7028772 |
| 24 | 7028772 |
| 25 | 32055014 |
| 26 | 32055014 |
| 27 | 146939924 |
| 28 | 146939924 |