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) |
|---|---|
| 6 | 1 |
| 7 | 0 |
| 8 | 1 |
| 9 | 3 |
| 10 | 4 |
| 11 | 7 |
| 12 | 22 |
| 13 | 51 |
| 14 | 152 |
| 15 | 501 |
| 16 | 1739 |
| 17 | 6548 |
| 18 | 26260 |
| 19 | 110292 |
| 20 | 483545 |
| 21 | 2198726 |
| 22 | 10327116 |
| 23 | 49965520 |
| 24 | 248481062 |
| 25 | 1267987437 |
| 26 | 6630660484 |
| 27 | 35492360163 |
| 28 | 194283212876 |