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 | 10 |
| 11 | 32 |
| 12 | 167 |
| 13 | 899 |
| 14 | 6470 |
| 15 | 55815 |
| 16 | 549981 |
| 17 | 6155795 |
| 18 | 78520177 |
| 19 | 1123544810 |
| 20 | 18005054988 |
| 21 | 322434738089 |
| 22 | 6427598615569 |