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) |
|---|---|
| 1 | 12 |
| 2 | 168 |
| 3 | 1896 |
| 4 | 30240 |
| 5 | 271464 |
| 6 | 4247040 |
| 7 | 39156480 |
| 8 | 636854400 |
| 9 | 5817876000 |
| 10 | 72749094432 |
| 11 | 852203639280 |
| 12 | 15743437516800 |
| 13 | 116720110574544 |
| 14 | 1518251476008960 |
| 15 | 17220536137159296 |
| 16 | 292933954031846400 |
| 17 | 2420303924088730368 |
| 18 | 38936041113123840000 |
| 19 | 348523635677043192936 |