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 | 11 |
| 6 | 211 |
| 7 | 1009 |
| 8 | 3851 |
| 9 | 7523 |
| 10 | 9403 |
| 11 | 18367 |
| 12 | 213821 |
| 13 | 815663 |
| 14 | 2010764683 |
| 15 | 831632781251 |
| 16 | 23636425261531 |
| 17 | 537430088605367 |
| 18 | 7896825413969130677 |
| 19 | 226627774989027955951103 |
| 20 | 451298593966207394017315520293 |