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) |
|---|---|
| 2 | 1 |
| 3 | 160 |
| 4 | 39900 |
| 5 | 15120000 |
| 6 | 8202070800 |
| 7 | 6058891238400 |
| 8 | 5860547004312000 |
| 9 | 7196668193594880000 |
| 10 | 10944624305020966560000 |
| 11 | 20199809308312018344960000 |
| 12 | 44490168120726255724917120000 |
| 13 | 115290834599202214240544256000000 |
| 14 | 347284815748143369922163257920000000 |