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 | 2 |
| 2 | 3 |
| 3 | 5 |
| 4 | 7 |
| 5 | 17 |
| 6 | 31 |
| 7 | 71 |
| 8 | 127 |
| 9 | 157 |
| 10 | 227 |
| 11 | 257 |
| 12 | 293 |
| 13 | 349 |
| 14 | 419 |
| 15 | 503 |
| 16 | 16007 |
| 17 | 32783 |
| 18 | 33329 |
| 19 | 80429 |
| 20 | 220919 |
| 21 | 786433 |
| 22 | 878831 |
| 23 | 85790399 |
| 24 | 10666238497 |
| 25 | 394760836573 |
| 26 | 22265159019759079 |
| 27 | 617347651958903360669 |
| 28 | 98459899570803393815965301 |