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 | 5 |
| 4 | 13 |
| 5 | 34 |
| 6 | 91 |
| 7 | 245 |
| 8 | 659 |
| 9 | 1786 |
| 10 | 4846 |
| 11 | 13182 |
| 12 | 35962 |
| 13 | 98418 |
| 14 | 270121 |
| 15 | 743533 |
| 16 | 2052073 |
| 17 | 5678238 |
| 18 | 15750382 |
| 19 | 43793198 |
| 20 | 122042214 |