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 | 6 |
| 3 | 17 |
| 4 | 46 |
| 5 | 122 |
| 6 | 321 |
| 7 | 842 |
| 8 | 2206 |
| 9 | 5777 |
| 10 | 15126 |
| 11 | 39602 |
| 12 | 103681 |
| 13 | 271442 |
| 14 | 710646 |
| 15 | 1860497 |
| 16 | 4870846 |
| 17 | 12752042 |
| 18 | 33385281 |
| 19 | 87403802 |
| 20 | 228826126 |
| 21 | 599074577 |
| 22 | 1568397606 |
| 23 | 4106118242 |
| 24 | 10749957121 |
| 25 | 28143753122 |
| 26 | 73681302246 |
| 27 | 192900153617 |
| 28 | 505019158606 |
| 29 | 1322157322202 |