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 | 7 |
| 3 | 35 |
| 4 | 189 |
| 5 | 1038 |
| 6 | 5797 |
| 7 | 32747 |
| 8 | 186615 |
| 9 | 1070762 |
| 10 | 6177698 |
| 11 | 35802935 |
| 12 | 208279007 |
| 13 | 1215507450 |
| 14 | 7113090285 |
| 15 | 41724381765 |
| 16 | 245258504925 |
| 17 | 1444292029818 |
| 18 | 8519114704870 |
| 19 | 50323176446818 |
| 20 | 297654524450998 |