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 | 3 |
| 2 | 24 |
| 3 | 348 |
| 4 | 7812 |
| 5 | 255756 |
| 6 | 11747504 |
| 7 | 714121392 |