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 | 5 |
| 3 | 10 |
| 4 | 22 |
| 5 | 46 |
| 6 | 97 |
| 7 | 200 |
| 8 | 412 |
| 9 | 844 |
| 10 | 1729 |
| 11 | 3536 |
| 12 | 7227 |
| 13 | 14754 |
| 14 | 30093 |
| 15 | 61312 |
| 16 | 124782 |
| 17 | 253664 |
| 18 | 515085 |
| 19 | 1044796 |
| 20 | 2117158 |
| 21 | 4286330 |
| 22 | 8671103 |
| 23 | 17529304 |
| 24 | 35416016 |
| 25 | 71518510 |
| 26 | 144362774 |
| 27 | 291299094 |
| 28 | 587617054 |
| 29 | 1185060666 |
| 30 | 2389424213 |