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 | 1 |
| 2 | 4 |
| 3 | 5 |
| 4 | 9 |
| 5 | 293 |
| 6 | 302 |
| 7 | 595 |
| 8 | 165712 |
| 9 | 166307 |
| 10 | 332019 |
| 11 | 830345 |
| 12 | 4483744 |
| 13 | 5314089 |
| 14 | 25740100 |
| 15 | 31054189 |
| 16 | 118902667 |
| 17 | 863372858 |
| 18 | 982275525 |
| 19 | 1845648383 |
| 20 | 82190804377 |
| 21 | 84036452760 |
| 22 | 418336615417 |
| 23 | 920709683594 |
| 24 | 1339046299011 |
| 25 | 2259755982605 |
| 26 | 5858558264221 |
| 27 | 49128222096373 |
| 28 | 104115002456967 |
| 29 | 153243224553340 |