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) |
|---|---|
| 2 | -11 |
| 3 | -108 |
| 4 | -425 |
| 5 | 720 |
| 6 | 25678 |
| 7 | 255048 |
| 8 | 1901298 |
| 9 | 12339600 |
| 10 | 73794315 |
| 11 | 418519612 |
| 12 | 2289264465 |
| 13 | 12207642976 |
| 14 | 63925371180 |
| 15 | 330387702160 |
| 16 | 1691454191604 |
| 17 | 8600517968736 |
| 18 | 43516016460465 |
| 19 | 219401923888740 |