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 | 2 |
| 2 | 9 |
| 3 | 30 |
| 4 | 5838 |
| 5 | 7748 |
| 6 | 18941 |
| 7 | 20860 |
| 8 | 884009 |
| 9 | 919276 |
| 10 | 6366597 |
| 11 | 74329482 |
| 12 | 178532068 |
| 13 | 2130862251 |
| 14 | 2162384953 |
| 15 | 2614341660 |
| 16 | 4416513965 |
| 17 | 10812791039 |
| 18 | 11799700554 |
| 19 | 20743576863 |
| 20 | 36600453328 |
| 21 | 76931780134 |
| 22 | 109063095528 |