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 | 807040 |
| 5 | 29389312 |
| 6 | 406924416 |
| 7 | 5493496080 |
| 8 | 40707459840 |
| 9 | 237337333008 |
| 10 | 1379876481024 |
| 11 | 6125076674736 |
| 12 | 21640203681408 |
| 13 | 84999017731696 |
| 14 | 274088863846528 |
| 15 | 766309629591264 |