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 | 4 |
| 2 | 7 |
| 3 | 14 |
| 4 | 27 |
| 5 | 54 |
| 6 | 107 |
| 7 | 214 |
| 8 | 427 |
| 9 | 854 |
| 10 | 1707 |
| 11 | 3414 |
| 12 | 6827 |
| 13 | 13654 |
| 14 | 27307 |
| 15 | 54614 |
| 16 | 109227 |
| 17 | 218454 |
| 18 | 436907 |
| 19 | 873814 |
| 20 | 1747627 |
| 21 | 3495254 |
| 22 | 6990507 |
| 23 | 13981014 |
| 24 | 27962027 |
| 25 | 55924054 |
| 26 | 111848107 |
| 27 | 223696214 |
| 28 | 447392427 |
| 29 | 894784854 |
| 30 | 1789569707 |