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) |
|---|---|
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 3 |
| 6 | 22 |
| 7 | 242 |
| 8 | 4691 |
| 9 | 154942 |
| 10 | 8808453 |
| 11 | 867760434 |
| 12 | 151839645047 |
| 13 | 48280546012319 |