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) |
|---|---|
| 1 | 7 |
| 2 | 11 |
| 3 | 19 |
| 4 | 41 |
| 5 | 79 |
| 6 | 163 |
| 7 | 331 |
| 8 | 653 |
| 9 | 1307 |
| 10 | 2617 |
| 11 | 5231 |
| 12 | 10463 |
| 13 | 20929 |
| 14 | 41863 |
| 15 | 83717 |
| 16 | 167437 |
| 17 | 334877 |
| 18 | 669763 |
| 19 | 1339523 |
| 20 | 2679037 |
| 21 | 5358083 |
| 22 | 10716163 |
| 23 | 21432317 |
| 24 | 42864671 |
| 25 | 85729367 |
| 26 | 171458671 |
| 27 | 342917357 |
| 28 | 685834729 |
| 29 | 1371669443 |
| 30 | 2743338881 |