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 | 131071 |
| 2 | 129009091 |
| 3 | 17050729021 |
| 4 | 745759583941 |
| 5 | 16163719991611 |
| 6 | 215703854542471 |
| 7 | 2019169299698041 |
| 8 | 14425381885981321 |
| 9 | 83322818300333431 |
| 10 | 405447028499293771 |
| 11 | 1713164078241143221 |
| 12 | 6431804812640900941 |
| 13 | 21840930809949857971 |
| 14 | 68034778606362163471 |
| 15 | 196621779843659466481 |