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 | 1 |
| 5 | 2 |
| 6 | 12 |
| 7 | 51 |
| 8 | 229 |
| 9 | 969 |
| 10 | 4098 |
| 11 | 16867 |
| 12 | 68925 |
| 13 | 278907 |
| 14 | 1123302 |
| 15 | 4507640 |