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) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 3 |
| 4 | 13 |
| 5 | 45 |
| 6 | 105 |
| 7 | 159 |
| 8 | 297 |
| 9 | 1443 |
| 10 | 2977 |
| 11 | 3699 |
| 12 | 11709 |
| 13 | 12357 |
| 14 | 43165 |
| 15 | 121995 |