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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 64 |
| 5 | 750 |
| 6 | 10584 |
| 7 | 175616 |
| 8 | 3359232 |
| 9 | 72900000 |
| 10 | 1771561000 |
| 11 | 47692136448 |
| 12 | 1409582685888 |
| 13 | 45392319784448 |
| 14 | 1582328671875000 |
| 15 | 59373627899904000 |
| 16 | 2386420683693101056 |
| 17 | 102303226385042448384 |
| 18 | 4659806991485780193672 |