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 | 11 |
| 2 | 3 |
| 3 | 41 |
| 4 | 239 |
| 5 | 21649 |
| 6 | 53 |
| 7 | 2071723 |
| 8 | 1111111111111111111 |
| 9 | 11111111111111111111111 |
| 10 | 3191 |
| 11 | 2791 |
| 12 | 2028119 |
| 13 | 83 |
| 14 | 173 |
| 15 | 35121409 |
| 16 | 107 |
| 17 | 2559647034361 |
| 18 | 733 |
| 19 | 493121 |
| 20 | 241573142393627673576957439049 |
| 21 | 12171337159 |