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 | 5 |
| 2 | 11 |
| 3 | 83 |
| 4 | 769 |
| 5 | 3571 |
| 6 | 52631 |
| 7 | 1428571 |
| 8 | 3703703 |
| 9 | 83333333 |
| 10 | 769230769 |
| 11 | 5882352941 |
| 12 | 13513513513 |
| 13 | 588235294117 |
| 14 | 7142857142857 |
| 15 | 12195121951219 |
| 16 | 151515151515151 |
| 17 | 2777777777777777 |
| 18 | 22727272727272727 |
| 19 | 1111111111111111111 |