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 | 0 |
| 5 | 0 |
| 6 | 1 |
| 7 | 1 |
| 8 | 6 |
| 9 | 17 |
| 10 | 69 |
| 11 | 239 |
| 12 | 962 |
| 13 | 3864 |
| 14 | 17049 |
| 15 | 79607 |
| 16 | 403758 |
| 17 | 2209386 |
| 18 | 13138818 |
| 19 | 84841130 |
| 20 | 595825731 |