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) |
|---|---|
| 5 | 1 |
| 6 | 30 |
| 7 | 525 |
| 8 | 7000 |
| 9 | 78750 |
| 10 | 787500 |
| 11 | 7218750 |
| 12 | 61875000 |
| 13 | 502734375 |
| 14 | 3910156250 |
| 15 | 29326171875 |
| 16 | 213281250000 |
| 17 | 1510742187500 |
| 18 | 10458984375000 |
| 19 | 70971679687500 |
| 20 | 473144531250000 |
| 21 | 3105010986328125 |
| 22 | 20091247558593750 |
| 23 | 128360748291015625 |
| 24 | 810699462890625000 |