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 | 1440 |
| 4 | 40896 |
| 5 | 364800 |
| 6 | 1902240 |
| 7 | 7197120 |
| 8 | 21960960 |
| 9 | 57407616 |
| 10 | 133531200 |
| 11 | 283488480 |
| 12 | 559247040 |
| 13 | 1038660480 |