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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 180 |
| 7 | 3150 |
| 8 | 105840 |
| 9 | 4740120 |
| 10 | 260366400 |
| 11 | 17411708160 |
| 12 | 1402666372800 |
| 13 | 134317686068280 |
| 14 | 15090968212259940 |
| 15 | 1966411584852664950 |
| 16 | 294177397021128260640 |
| 17 | 50080787858122187821200 |