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) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 360 |
| 3 | 15120 |
| 4 | 604800 |
| 5 | 3421440 |
| 6 | 653837184000 |
| 7 | 37362124800 |
| 8 | 762187345920000 |
| 9 | 2554547108585472000 |
| 10 | 401428831349145600000 |
| 11 | 143888775912161280000 |
| 12 | 846912068365871834726400000 |
| 13 | 93067260259985915904000000 |
| 14 | 2706661834818276108533760000000 |