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 | 3 |
| 4 | 8 |
| 5 | 51 |
| 6 | 569 |
| 7 | 3465 |
| 8 | 7499 |
| 9 | 10964 |
| 10 | 18463 |
| 11 | 29427 |
| 12 | 1313251 |
| 13 | 1342678 |
| 14 | 2655929 |
| 15 | 3998607 |
| 16 | 10653143 |
| 17 | 67917465 |
| 18 | 757745258 |
| 19 | 4614389013 |
| 20 | 9986523284 |
| 21 | 14600912297 |
| 22 | 24587435581 |
| 23 | 39188347878 |
| 24 | 1748874742213 |
| 25 | 1788063090091 |
| 26 | 3536937832304 |
| 27 | 5325000922395 |