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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 80 |
| 5 | 4845 |
| 6 | 138792 |
| 7 | 2893338 |
| 8 | 50507680 |
| 9 | 787265325 |
| 10 | 11345154600 |
| 11 | 154362306956 |
| 12 | 2010147294672 |
| 13 | 25288375607950 |