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) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 2 |
| 3 | 2 |
| 4 | 2 |
| 5 | 4 |
| 6 | 6 |
| 7 | 10 |
| 8 | 18 |
| 9 | 36 |
| 10 | 70 |
| 11 | 138 |
| 12 | 274 |
| 13 | 548 |
| 14 | 1094 |
| 15 | 2186 |
| 16 | 4370 |
| 17 | 8740 |
| 18 | 17478 |
| 19 | 34954 |
| 20 | 69906 |
| 21 | 139812 |
| 22 | 279622 |
| 23 | 559242 |
| 24 | 1118482 |
| 25 | 2236964 |
| 26 | 4473926 |