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 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 3 |
| 8 | 21 |
| 9 | 78 |
| 10 | 302 |
| 11 | 1139 |
| 12 | 4156 |
| 13 | 14791 |
| 14 | 52529 |
| 15 | 183565 |
| 16 | 635691 |
| 17 | 2183533 |
| 18 | 7314869 |
| 19 | 25303217 |