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) |
|---|---|
| 2 | 5 |
| 3 | 11 |
| 4 | 17 |
| 5 | 67 |
| 6 | 431 |
| 7 | 853 |
| 8 | 2531 |
| 9 | 27733 |
| 10 | 360391 |
| 11 | 720743 |
| 12 | 12252259 |
| 13 | 232792597 |
| 14 | 5354228921 |
| 15 | 26771144429 |
| 16 | 80313433231 |
| 17 | 2329089562843 |
| 18 | 72201776446853 |
| 19 | 144403552893641 |
| 20 | 5342931457063253 |
| 21 | 219060189739591279 |