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) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 6 |
| 3 | 300 |
| 4 | 13320 |
| 5 | 620130 |
| 6 | 31406550 |
| 7 | 1743174216 |
| 8 | 105889417200 |
| 9 | 7010411889690 |
| 10 | 503353562247360 |
| 11 | 39003404559533700 |
| 12 | 3246506259033473436 |
| 13 | 289042023964190515200 |
| 14 | 27418894569798460848210 |
| 15 | 2761554229456140638184840 |
| 16 | 294364593823858690215256200 |