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) |
|---|---|
| 3 | 0 |
| 4 | 1 |
| 5 | 1 |
| 6 | 2 |
| 7 | 3 |
| 8 | 11 |
| 9 | 33 |
| 10 | 178 |
| 11 | 1011 |
| 12 | 6816 |
| 13 | 47669 |
| 14 | 352901 |
| 15 | 2680512 |
| 16 | 20939433 |
| 17 | 166713951 |
| 18 | 1352143860 |
| 19 | 11129922982 |