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 | 4 |
| 4 | 8 |
| 5 | 54 |
| 6 | 140 |
| 7 | 1116 |
| 8 | 2976 |
| 9 | 19828 |
| 10 | 58388 |
| 11 | 443892 |
| 12 | 1036180 |
| 13 | 9390024 |
| 14 | 27996724 |
| 15 | 175396812 |