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 | 6 |
| 3 | 66 |
| 4 | 0 |
| 5 | 11310 |
| 6 | 303810 |
| 7 | 28962934 |
| 8 | 557221665 |
| 9 | 15529888374 |
| 10 | 1219300152070 |
| 11 | 23900058257790 |
| 12 | 1231931106828345 |
| 13 | 500402553453949510 |
| 14 | 14990069451769732194 |
| 15 | 610385355391371697410 |