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 | 1 |
| 6 | 1 |
| 7 | 1 |
| 8 | 3 |
| 9 | 4 |
| 10 | 8 |
| 11 | 23 |
| 12 | 91 |
| 13 | 317 |
| 14 | 1353 |
| 15 | 6473 |
| 16 | 30834 |
| 17 | 148907 |
| 18 | 768178 |
| 19 | 3987517 |
| 20 | 20767030 |
| 21 | 110819167 |
| 22 | 599311836 |
| 23 | 3256610004 |