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 | 7 |
| 2 | 31 |
| 3 | 127 |
| 4 | 73 |
| 5 | 89 |
| 6 | 8191 |
| 7 | 151 |
| 8 | 131071 |
| 9 | 524287 |
| 10 | 337 |
| 11 | 178481 |
| 12 | 1801 |
| 13 | 262657 |
| 14 | 2089 |
| 15 | 2147483647 |
| 16 | 599479 |
| 17 | 122921 |
| 18 | 616318177 |
| 19 | 121369 |
| 20 | 164511353 |
| 21 | 2099863 |
| 22 | 23311 |
| 23 | 13264529 |
| 24 | 4432676798593 |
| 25 | 131071 |
| 26 | 20394401 |
| 27 | 201961 |
| 28 | 1212847 |
| 29 | 3203431780337 |