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 | 3 |
| 2 | 7 |
| 3 | 17 |
| 4 | 31 |
| 5 | 127 |
| 6 | 577 |
| 7 | 3361 |
| 8 | 4801 |
| 9 | 6961 |
| 10 | 8191 |
| 11 | 31249 |
| 12 | 131071 |
| 13 | 171697 |
| 14 | 524287 |
| 15 | 982801 |
| 16 | 1062881 |
| 17 | 1104097 |
| 18 | 1367857 |
| 19 | 1407841 |
| 20 | 1468897 |
| 21 | 2705137 |
| 22 | 3770257 |
| 23 | 6822817 |
| 24 | 7785457 |
| 25 | 10941841 |
| 26 | 14183137 |
| 27 | 15557041 |
| 28 | 18495361 |
| 29 | 20749681 |
| 30 | 25304497 |
| 31 | 36278161 |
| 32 | 38878561 |
| 33 | 44575681 |