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 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 23 |
| 5 | 102 |
| 6 | 499 |
| 7 | 2625 |
| 8 | 14601 |
| 9 | 84847 |
| 10 | 510614 |
| 11 | 3161964 |
| 12 | 20050770 |
| 13 | 129718404 |
| 14 | 853689031 |
| 15 | 5701759424 |
| 16 | 38574689104 |
| 17 | 263936457042 |
| 18 | 1824032887177 |
| 19 | 12718193293888 |
| 20 | 89386742081688 |
| 21 | 632746535420834 |
| 22 | 4508140253686638 |
| 23 | 32308561883462867 |
| 24 | 232790342330880572 |