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 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 6 |
| 5 | 11 |
| 6 | 23 |
| 7 | 45 |
| 8 | 89 |
| 9 | 172 |
| 10 | 331 |
| 11 | 641 |
| 12 | 1239 |
| 13 | 2405 |
| 14 | 4685 |
| 15 | 9156 |
| 16 | 17955 |
| 17 | 35323 |
| 18 | 69687 |
| 19 | 137804 |
| 20 | 273055 |
| 21 | 541963 |
| 22 | 1077194 |
| 23 | 2143479 |
| 24 | 4269285 |
| 25 | 8509953 |