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 | 3 |
| 2 | 5 |
| 3 | 11 |
| 4 | 23 |
| 5 | 53 |
| 6 | 125 |
| 7 | 307 |
| 8 | 769 |
| 9 | 1959 |
| 10 | 5039 |
| 11 | 13049 |
| 12 | 33929 |
| 13 | 88451 |
| 14 | 230957 |
| 15 | 603667 |
| 16 | 1578823 |
| 17 | 4130829 |
| 18 | 10810469 |
| 19 | 28295411 |
| 20 | 74067401 |
| 21 | 193893263 |
| 22 | 507590495 |
| 23 | 1328842801 |
| 24 | 3478880593 |
| 25 | 9107706243 |
| 26 | 23844088085 |
| 27 | 62424315227 |
| 28 | 163428464759 |
| 29 | 427860443429 |
| 30 | 1120151837069 |