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 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 165 |
| 5 | 5415 |
| 6 | 12705 |
| 7 | 256410 |
| 8 | 256410 |
| 9 | 6480303060 |
| 10 | 217245863835 |
| 11 | 946622690475 |
| 12 | 35511547806735 |
| 13 | 439116128090640 |
| 14 | 5714676453270219435 |