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 | 2 |
| 3 | 2 |
| 4 | 3 |
| 5 | 7 |
| 6 | 13 |
| 7 | 19 |
| 8 | 37 |
| 9 | 757 |
| 10 | 111779 |
| 11 | 670669 |
| 12 | 6371347 |
| 13 | 34204069 |
| 14 | 166437443 |
| 15 | 310854619 |
| 16 | 385634101 |
| 17 | 14188652209 |
| 18 | 42594124681 |
| 19 | 10825536799379161 |
| 20 | 154680726732318637 |