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 | 5 |
| 6 | 450 |
| 7 | 18900 |
| 8 | 588000 |
| 9 | 15876000 |
| 10 | 400075200 |
| 11 | 9779616000 |
| 12 | 237105792000 |
| 13 | 5779453680000 |
| 14 | 142845262560000 |
| 15 | 3599700616512000 |
| 16 | 92818726640640000 |
| 17 | 2454539660052480000 |
| 18 | 66664716210892800000 |
| 19 | 1861170036255129600000 |