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 | 7 |
| 3 | 43 |
| 4 | 769 |
| 5 | 1123 |
| 6 | 52631 |
| 7 | 1428571 |
| 8 | 2127659 |
| 9 | 14925373 |
| 10 | 769230769 |
| 11 | 5882352941 |
| 12 | 6369426751 |
| 13 | 588235294117 |
| 14 | 319488817891 |
| 15 | 9345794392523 |
| 16 | 24449877750611 |
| 17 | 662251655629139 |
| 18 | 1293661060802069 |
| 19 | 67114093959731543 |
| 20 | 244498777506112469 |