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) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 2 |
| 5 | 4 |
| 6 | 7 |
| 7 | 14 |
| 8 | 35 |
| 9 | 84 |
| 10 | 249 |
| 11 | 801 |
| 12 | 2977 |
| 13 | 12965 |
| 14 | 59937 |
| 15 | 313230 |
| 16 | 1701935 |
| 17 | 9755328 |
| 18 | 58021794 |
| 19 | 352152252 |