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 | 1 |
| 3 | 3 |
| 4 | 6 |
| 5 | 13 |
| 6 | 26 |
| 7 | 54 |
| 8 | 108 |
| 9 | 221 |
| 10 | 442 |
| 11 | 898 |
| 12 | 1796 |
| 13 | 3634 |
| 14 | 7268 |
| 15 | 14668 |
| 16 | 29336 |
| 17 | 59101 |
| 18 | 118202 |
| 19 | 237834 |
| 20 | 475668 |
| 21 | 956198 |
| 22 | 1912396 |
| 23 | 3841588 |
| 24 | 7683176 |
| 25 | 15425138 |
| 26 | 30850276 |
| 27 | 61908564 |
| 28 | 123817128 |
| 29 | 248377156 |
| 30 | 496754312 |