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 | 120 |
| 6 | 2520 |
| 7 | 43680 |
| 8 | 757680 |
| 9 | 13747104 |
| 10 | 264181680 |
| 11 | 5395040640 |
| 12 | 117080049240 |
| 13 | 2696387899920 |
| 14 | 65774992411128 |
| 15 | 1695845836077120 |
| 16 | 46110625382246880 |
| 17 | 1319345179723609920 |
| 18 | 39640903618873667040 |
| 19 | 1248193457738661143808 |