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 | 15 |
| 1 | 200 |
| 2 | 2672 |
| 3 | 37600 |
| 4 | 554880 |
| 5 | 8514560 |
| 6 | 134864640 |