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) |
|---|---|
| 3 | 6 |
| 4 | 108 |
| 5 | 2310 |
| 6 | 65700 |
| 7 | 2583126 |
| 8 | 142259628 |
| 9 | 11012710470 |
| 10 | 1196543891700 |
| 11 | 181782466114326 |
| 12 | 38435786111785788 |
| 13 | 11256358984173551430 |