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) |
|---|---|
| 0 | 2 |
| 1 | 2 |
| 2 | 3 |
| 3 | 7 |
| 4 | 13 |
| 5 | 61 |
| 6 | 61 |
| 7 | 421 |
| 8 | 853 |
| 9 | 2521 |
| 10 | 2521 |
| 11 | 27733 |
| 12 | 27733 |
| 13 | 360391 |
| 14 | 360391 |
| 15 | 360391 |
| 16 | 720743 |
| 17 | 12252259 |
| 18 | 12252259 |
| 19 | 232792561 |
| 20 | 232792561 |
| 21 | 232792561 |
| 22 | 232792561 |
| 23 | 5354228921 |
| 24 | 5354228921 |
| 25 | 26771144401 |
| 26 | 26771144401 |
| 27 | 80313433231 |
| 28 | 80313433231 |
| 29 | 2329089562843 |
| 30 | 2329089562843 |