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 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 7 |
| 5 | 15 |
| 6 | 29 |
| 7 | 57 |
| 8 | 111 |
| 9 | 218 |
| 10 | 429 |
| 11 | 841 |
| 12 | 1651 |
| 13 | 3239 |
| 14 | 6355 |
| 15 | 12473 |
| 16 | 24475 |
| 17 | 48029 |
| 18 | 94249 |
| 19 | 184946 |
| 20 | 362932 |
| 21 | 712194 |
| 22 | 1397569 |
| 23 | 2742507 |
| 24 | 5381729 |
| 25 | 10560797 |
| 26 | 20723884 |
| 27 | 40667338 |
| 28 | 79803197 |
| 29 | 156601100 |
| 30 | 307304821 |
| 31 | 603036937 |
| 32 | 1183364302 |
| 33 | 2322164658 |
| 34 | 4556879623 |