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) |
|---|---|
| 3 | 56 |
| 4 | 140 |
| 5 | 4200 |
| 6 | 331800 |
| 7 | 611520 |
| 8 | 8385930 |
| 9 | 1071856800 |
| 10 | 41086892000 |
| 11 | 78540000 |
| 12 | 38102655397426620 |
| 13 | 59089382788800 |
| 14 | 22241349900 |
| 15 | 2326493030400 |
| 16 | 7052419469195100 |
| 17 | 886638404171520 |