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 | 257 |
| 2 | 65537 |
| 3 | 2424833 |
| 4 | 26017793 |
| 5 | 63766529 |
| 6 | 825753601 |
| 7 | 1214251009 |
| 8 | 6487031809 |
| 9 | 2710954639361 |
| 10 | 2748779069441 |
| 11 | 6597069766657 |
| 12 | 25991531462657 |
| 13 | 76861124116481 |
| 14 | 151413703311361 |
| 15 | 1095981164658689 |
| 16 | 1238926361552897 |
| 17 | 1529992420282859521 |
| 18 | 2663848877152141313 |
| 19 | 3603109844542291969 |