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 | 6 |
| 5 | 56 |
| 6 | 327 |
| 7 | 1501 |
| 8 | 6000 |
| 9 | 21973 |
| 10 | 75711 |
| 11 | 249910 |
| 12 | 799098 |
| 13 | 2494870 |
| 14 | 7646824 |
| 15 | 23099662 |