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 | 2 |
| 1 | 2 |
| 2 | 3 |
| 3 | 6 |
| 4 | 11 |
| 5 | 26 |
| 6 | 56 |
| 7 | 97 |
| 8 | 204 |
| 9 | 415 |
| 10 | 769 |
| 11 | 1606 |
| 12 | 3268 |
| 13 | 6460 |
| 14 | 12889 |
| 15 | 25915 |
| 16 | 52046 |
| 17 | 104099 |
| 18 | 207000 |
| 19 | 416542 |
| 20 | 831430 |
| 21 | 1662247 |
| 22 | 3324374 |
| 23 | 6646337 |
| 24 | 13292865 |
| 25 | 26593542 |
| 26 | 53182276 |
| 27 | 106364450 |
| 28 | 212732814 |
| 29 | 425465107 |
| 30 | 850887793 |
| 31 | 1701801109 |