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 | 4 |
| 3 | 9 |
| 4 | 18 |
| 5 | 38 |
| 6 | 81 |
| 7 | 171 |
| 8 | 366 |
| 9 | 787 |
| 10 | 1693 |
| 11 | 3661 |
| 12 | 7938 |
| 13 | 17240 |
| 14 | 37540 |
| 15 | 81892 |
| 16 | 178907 |
| 17 | 391483 |
| 18 | 857769 |
| 19 | 1881618 |
| 20 | 4132225 |
| 21 | 9083823 |
| 22 | 19986954 |
| 23 | 44014447 |
| 24 | 97002134 |
| 25 | 213933655 |
| 26 | 472137851 |
| 27 | 1042626752 |
| 28 | 2303780392 |
| 29 | 5093189194 |
| 30 | 11265742842 |
| 31 | 24930884645 |
| 32 | 55196469010 |
| 33 | 122255756284 |